Plants erect to infrequently spreading, (0.3) 0.5–2.5 (3) dm long, 0.5–3 (5) dm wide, thinly pubescent; leaves basal or nearly so, the petiole 1–2 (3) cm long, the leaf-blade oblong or oblong-ovate to ovate, 0.3–1 (1.5) cm long, 0.3–0.8 (1) cm wide, thinly pubescent adaxially, densely tomentose abaxially; inflorescences mostly flat- topped and openly branched, not disarticulating at the nodes, usually reddish; bracts persistent, 2, opposite, usually foliaceous at proximal nodes and similar to proximal leaf blades only more reduced, short-petiolate, oblong-ovate to ovate, 0.3–0.8 cm long, 0.2–0.6 cm wide, becoming sessile, reduced and scalelike at distal nodes, linear, acicular, often acerose, 0.1–0.4 cm long 0.05–0.1 cm wide, the awns straight, 0.5–1 mm long; involucres in open clusters with 1 at node of dichotomies, cylindric, not ventricose, 3-angled and 6-ribbed, 3– 4.5 mm long, not corrugate, thinly pubescent, reddish, without scarious or membranous margins, the teeth spreading, unequal, 0.7–1.5 mm long, 3 longer ones more erect than 3 shorter and less-prominent ones, the awns uncinate, 0.5–1 mm long; flowers long-exserted, the perianth rose to red, infrequently with white tepals, cylindric, 4.5–6 mm long, pubescent, the hypanthium 2/3 length of perianth, the tepals monomorphic to slightly dimorphic, narrowly oblanceolate, rounded apically, those of outer whorl occasionally slightly broader and longer than those of inner whorl, the stamens 9, mostly included, the filaments distinct, adnate at base of hypanthium, 4–6 mm long, glabrous, the anthers pink to red, oblong, 0.5–0.6 mm long; achenes brown, lenticular, 4–4.5 mm long, the embryo straight.
Author Archives: xochipelli2012
Oxytheca dendroidea var. dendroidea
Plants erect to spreading, 0.4–4 dm tall, 0.3–4.5 dm across; leaves basal, the leaf blades linear to linear- oblanceolate, 1–4.5 cm long, 0.1–0.7 cm wide, densely hirsute and sparsely glandular; aerial flowering stems sparsely to densely glandular, grayish; inflorescences cymose, open to diffuse, mostly 5–40 cm long, essentially glabrous, grayish; bracts 1–18 mm long, 0.5–4 mm wide, linear to subulate or triangular, sometimes foliaceous, (2) 3 (4) at first node, otherwise 2 or 3 and free or basally connate, hirsute and glandular, with awns 0.2–0.5 mm long, these often lacking at upper nodes; peduncles erect or deflexed, slender, 0.5–1.5 cm long, occasionally lacking at uppermost nodes, glabrous; involucres narrowly turbinate, 1– 2 mm long, typically glabrous abaxially, the teeth (3) 4 mm long, the awns 0.5–3 mm long, grayish; flowers 2– 6, the perianth white to pink, 1–2 mm long, glabrous to strigose and sparsely glandular abaxially, the tepals essentially entire, dimorphic with outer 3 elliptic to oval or ovate and pubescent abaxially, those of inner 3 elliptic oblong to narrowly ovate and glabrous or sometimes strigose abaxially at base, the filaments 0.5–1.5 mm long, glabrous, the anthers oval, cream to red; achenes globose-lenticular, yellow-brown to maroon, 2–2.5 mm long, glabrous; 2n = 40.
Eriogonum hirtellum
Plants herbs, spreading, 1–3.5 dm tall, 2–4 (6) dm across, hirtellous to glabrescent; stems with caudex spreading, the aerial flowering stems erect, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, non-flowering aerial branches, 0.8–2.5 (3) dm long, essentially glabrous; leaves basal, occasionally in rosettes, the petioles 0.3–4 cm long, hirtellous, the blades broadly oblanceolate to elliptic or ovate, 0.5–2 (2.5) cm long, 0.3–0.8 (1.2) cm wide, hirtellous to glabrescent, the margins plane, entire; inflorescences subcapitate, (1.5) 2–5 cm wide, the branches subglabrous, the bracts 5, semi-foliaceous, 0.2–0.5 cm long, 0.1–0.2 cm wide, absent immediately below involucre; involucres 1 per node (often appearing clustered), narrowly turbinate, 5–6 mm long, 2–3 mm wide, hirtellous, the teeth 5–6, erect, 0.8–1 mm long; flowers 3–3.5 (4) mm long, including a 0.1–0.2 mm long stipelike base, the perianth bright yellow, sparsely white-pilose abaxially, the tepals dimorphic, those of outer whorl spatulate, 2.5–3 mm long wide, those of inner whorl oblanceolate, 1 mm long wide, the stamens exserted, 3–5 mm long, the filaments pilose proximally; achenes light brown, 3–3.5 mm long, glabrous except for pubescent beak.
Eriogonum villosissimum
Plants herbs, spreading, compact, 0.7–1 (1.2) dm tall, (0.5) 0.4–1 dm across, tomentose and spreading villous; stems with caudex spreading, the aerial flowering stems erect or nearly so, slender, solid, not fistulose, arising directly from caudex branches, (0.5) 0.7–0.9 (1.1) dm long, tomentose and spreading villous, with a whorl of 3 foliaceous bracts mostly at midlength, 0.5–1 cm long, 0.4–0.7 cm wide; leaves basal, in loosely arranged rosettes, the petioles 0.4–0.8 cm long, tomentose and appressed to slightly villous, the blades ovate, 0.5–1.5 cm long, 0.5–1 cm wide, densely white tomentose and appressed to slightly spreading villous abaxially, greenish- white and slightly less densely tomentose adaxially, the margins entire, plane or slightly enrolled; inflorescences capitate, 1–2 cm wide, the branches absent, the bracts absent immediately below involucre; involucres 1 per node, campanulate, 4.5–7 mm long, 5–8 mm wide, tomentose and densely villous, the teeth 5–8, erect, 0.5–0.9 mm long; flowers 2.5–5 mm long, including a (0.1) 0.2–0.3 mm long stipelike base, the perianth bright yellow, glabrous, the tepals monomorphic, oblong-obovate, the stamens slightly exserted, 2.5–5 mm long, the filaments slightly pilose proximally; achenes light brown, 4–5 mm long, glabrous.
Eriogonum elatum var. villosum
Plants herbs, erect, not scapose, 4–8 (15) dm tall, 1–4 dm across, glabrous or villous; stems erect, without persistent leaf bases, up to 1/5 height of plant, the caudex stems absent, the aerial flowering stems erect, slender to stout, solid or hollow, infrequently fistulose, 1.5–4 (8) dm long, villous; leaves basal, the petioles 5–25 cm long, villous, the blades lanceolate to lance-ovate, 4–15 (25) cm long, 1.5–6 cm wide, loosely villous and green on both surfaces or infrequently thinly tomentose abaxially and glabrate adaxially, the margins plane; inflorescences cymose, 15–50 cm long, 10–30 cm wide, the branches villous, the bracts 3, semi-foliaceous, linear, and 5–30 mm long, 2–5 mm wide proximally, scalelike, triangular, and 1–4 mm long distally; peduncles absent or slender, erect, 0.5–4 cm long, glabrous or tomentose; involucres 1 per node or 2–5 per cluster, turbinate, (2.5) 3–4 mm long, 2.5–3 mm wide, glabrous or slightly tomentose, the teeth 5, erect, 0.4–0.9 mm long; flowers 2.5–4 mm long, glabrous, the perianth white, pubescent abaxially, the hypanthium 1⁄4 length of perianth, the tepals monomorphic, obovate, the stamens exserted, 2.5–4 mm long, the filaments pilose proximally; achenes light brown, 3.5–4 mm long, glabrous.
Eriogonum strictum var. anserinum
Plants herbs, erect, loosely to densely matted, not scapose, 1–5 dm tall, 1–10 dm across, tomentose or glabrous; stems spreading to erect, with or without persistent leaf bases, up to 1⁄4 height of plant, the caudex stems absent or spreading to matted, the aerial flowering stems erect to spreading, slender, solid, not fistulose, 1–3 dm long, tomentose or glabrous; leaves basal, 1 per node, the petioles rarely twisted or curled, 1–6 cm long, mostly tomentose, the blades elliptic to ovate, 0.5–2.5 (4) cm long, (0.3) 0.5–1.5 cm wide, lanate, tomentose to floccose on both surfaces, sometimes sparsely tomentose to floccose and greenish or floccose to subglabrous or glabrous adaxially, the margins plane; inflorescences umbellate-cymose to cymose, 1–20 cm long, 3–25 cm wide, the branches dichotomous, tomentose to floccose or less often glabrous, the bracts 3, scalelike, triangular, 1–3 mm long; peduncles absent; involucres 1 per node, rarely 2–5 per cluster, narrowly turbinate to turbinate-campanulate, 4–6 mm long, 1.5–5 mm wide, tomentose or glabrous, the teeth 5, erect, 0.5–1.3 mm long; flowers 3–5 (6) mm long, the perianth yellow or white to rose or purple, glabrous, the hypanthium only at base of perianth, the tepals dimorphic, those of outer whorl elliptic to nearly orbiculate, 2–3 mm long and wide, those of inner whorl oblanceolate to oblong, 3–4 mm long, 1–2 mm wide, the stamens included to slightly exserted, 2–5 mm long, the filaments pilose proximally; achenes light brown to brown, 3– 3.5 mm long, glabrous.
Eriogonum heracleoides var. heracleoides
Plants herbs, spreading mats, infrequently polygamodioecious, 1–6 (7) dm tall, 2–10 dm across, tomentose to floccose; stems with caudex spreading, the aerial flowering stems erect, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, nonflowering aerial branches, (0.5) 1–3.5 (5) dm long, with a distinct whorl of (2) 5–10, linear to oblanceolate, foliaceous bracts about mid-length, 0.5–4 (5) cm long, 0.2–1 (1.5) cm wide, mostly tomentose to floccose; leaves in loose rosettes, the petioles 0.5–3 cm long, usually floccose, the blades usually linear to oblanceolate, (1.5) 2–5 cm long, 0.2–1 (1.5) cm wide, densely white-lanate to tomentose on both surfaces or only abaxially, thinly floccose or glabrous and green adaxially, the margins entire, plane; inflorescences simple or compound-umbellate, rarely reduced and compact, 1–10 cm long and wide, the branches tomentose to floccose, the bracts 3–10 or more, foliaceous at proximal node, oblanceolate to linear, 0.3–1 cm long, 0.2–0.4 cm wide, usually scalelike distally, 1–5 mm long, 0.5–2.5 mm wide; involucres 1 per node, turbinate to campanulate, 3–4.5 mm long, 2.5–5 (6) mm wide, tomentose, rarely glabrous, the teeth 6–12 or more, lobelike, reflexed, 1.5–5 mm long; flowers 4–9 mm long, including a 1.5–3 mm long stipelike base, the perianth white to cream or ochroleucous, glabrous, the tepals monomorphic, spatulate to oblong-ovate, the stamens exserted, 4–8 mm long, the filaments pilose proximally; achenes light to dark brown, (2) 3.5–5 mm long, glabrous except for sparsely pubescent beak.
Eriogonum fasciculatum var. foliolosum
Plants shrubs, rounded to erect, 6–15 dm tall, (8) 10–25 dm across; aerial flowering stems thinly tomentose or glabrous; leaf blades linear-oblanceolate to oblanceolate, 0.6–1.2 cm long, 0.1–0.4 cm wide, densely white- tomentose abaxially, less so to green and floccose adaxially, the margins plane usually tightly revolute; inflorescences open and mostly cymose, the branches thinly tomentose or glabrous; involucres turbinate, 3–4 mm long, (1.5) 2–2.5 mm wide, pubescent; perianth pubescent at least proximally. 2n = 80.
Eriogonum roseum
Plants herbs, erect, 1–8 dm tall, thinly tomentose to floccose, whitish to grayish or brownish to reddish-brown; aerial flowering stems erect, 0.5–3 dm long, thinly tomentose to floccose; leaves basal and cauline; basal: petiole 1–4 cm long, thinly tomentose to floccose, blade oblanceolate to narrowly oblong, 1–3 (5) cm long, (0.3) 0.5–1 (2) cm wide, tomentose on both surfaces, sometimes merely floccose and grayish or brownish to reddish-brown adaxially; cauline: petiole 0.3–1.5 (2) cm long, mostly floccose, blade elliptic, 0.5–3 cm long, 0.3–1 cm wide, mostly tomentose and whitish to grayish; inflorescences cymose, often distally uniparous due to suppression of secondary branches, open, 10–70 cm long, 10–45 cm wide, the branches straight or nearly so, infrequently inwardly curved distally, thinly tomentose to floccose, the bracts 1–3 mm long and wide; peduncles absent; involucres appressed to branches, cylindric, (3.5) 4–5 mm long, 2–3 mm wide, the teeth 5, erect, 0.2–0.4 mm long; flowers 1.5–2 (2.5) mm long, the perianth white to pink or red, occasionally yellow, glabrous, the tepals monomorphic, narrowly obovate to oblong, the stamens included, 1–1.5 mm long, the filaments pilose proximally; achenes brown, trigonous, 1.8–2 (2.2) mm long. 2n = 18.
Eriogonum umbellatum var. speciosum
Plants shrubs, spreading to rounded, 5–15 (20) dm tall, 5–20 dm across; aerial flowering stems erect, 1.5–3 dm long, mostly tomentose, without one or more foliaceous bracts about mid-length; leaves in loose rosettes, the blades elliptic to ovate, 1–3 cm long, 0.5–2.5 cm wide, densely gray-lanate to tomentose abaxially, floccose or glabrous and green adaxially, the margins plane; inflorescences compound-umbellate, branched 2–4 times, the branches tomentose, without a whorl of bracts about midlength; involucral tubes 4–6 mm long, the lobes 3–5 mm long; flowers 7–10 (12) mm long, the perianth bright yellow.
Eriogoneae 
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