Plants herbs, spreading, matted, synoecious, 1–2.5 (3) dm tall, 3–13 dm across, tomentose; 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, 1–2.5 (3) dm long, tomentose; leaves in loose basal rosettes, the petioles 0.5–1 cm long, tomentose, the blades oblong to obovate, (0.7) 1–1.5 cm long, (0.4) 0.8– 1.3 cm wide, usually densely brown-tomentose abaxially, tomentose to thinly tomentose, floccose or glabrate adaxially, the margins entire, plane; inflorescences umbellate, rarely with an additional bracteate branch and 1 peduncle with 1 involucre, 0.8–3 cm long, 1–3.5 cm wide, the branches thinly tomentose, the bracts 4–6 (8) at first node, lanceolate, 0.5–1.5 cm long, 0.2–0.9 cm wide, scalelike distally, 1–3 mm long, 0.5–1.5 mm wide; involucres 1 per node, turbinate, 5–8 mm long, 3–5 mm wide, tomentose, the teeth 5–8, erect, 0.8–2 mm long; flowers 3–5 mm long, including a 0.3–0.6 mm long stipelike base, the perianth sulphur yellow, glabrous, the tepals monomorphic, spatulate to obovate, the stamens exserted, 3–4 mm long, the filaments pilose proximally, infrequently glabrous; achenes light brown, 3.5–5 mm long, glabrous except for sparsely pubescent beak.
Author Archives: xochipelli2012
Eriogonum umbellatum var. goodmanii
Plants herbs, spreading to prostrate mats, 1–4.5 (5) dm tall, 4–7 dm across; aerial flowering stems erect, 1–2.5 (4) dm long, floccose, without one or more foliaceous bracts about midlength; leaves in mostly loose rosettes, the blades elliptic to ovate, 0.5–2 (3.5) cm long, 0.5–1 (1.5) cm wide, densely lanate abaxially, tomentose to rarely floccose adaxially, the margins plane; inflorescences umbellate, the branches (2.5) 3–5 (8) cm long, floccose, without a whorl of bracts about midlength; involucral tubes 2–3 mm long, the lobes 2.5–4 mm long; flowers 6–8 (9) mm long, the perianth bright yellow.
Eriogonum nudum var. nudum
Plants 3–10 dm tall; aerial flowering stems not fistulose, (1.5) 2–4 dm long, glabrous; leaves basal, the blades 1–5 cm long, 0.5–2 cm wide, tomentose abaxially, thinly floccose or glabrous adaxially, the margins plane; inflorescences cymose, 20–50 cm long, the branches glabrous; involucres 2–5 per cluster, 3–5 mm long, glabrous or sparsely pubescent; flowers 2–3 mm long, the perianth white, rarely yellow, glabrous. 2n = 40.
Eriogonum ursinum var. ursinum
Plants herbs, spreading, matted, synoecious, 0.5–4 dm tall, (1.5) 2–8 (12) dm across, thinly tomentose to floccose or glabrate; 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, 0.4–4 dm long, thinly tomentose to floccose or glabrate; leaves in rather compact basal rosettes, the petioles 0.1–1.5 cm long, tomentose, the blades elliptic, 0.7–2 (2.2) cm long, 0.4–1 (1.2) cm wide, or ovate, 0.8–1.4 (2.5) cm long, 0.5– 1.2 (2) cm wide, densely white- or rufous-tomentose abaxially, thinly tomentose, sparsely floccose, or glabrous and greenish adaxially, the margins slightly wavy; inflorescences compound-umbellate, 1–3 (6) cm long, 1–5 cm wide, thinly tomentose to glabrate; bracts: proximal 3–8, lanceolate to narrowly elliptic, 0.5–2 cm long, 0.25–1 cm wide, distal 3, semi-foliaceous, midway along branch, linear to narrowly lanceolate, 0.7–1 cm long, 0.1–0.25 cm wide, or ± scalelike below involucre, 1–5 mm long; involucres 1 per node, turbinate to turbinate- campanulate, 3.5–8 mm long, 2.5–4 mm wide, villous, the teeth 5–8, erect, 0.5–2 mm long; flowers 5–7 mm long at anthesis, 6.5–9 mm long in fruit, including a 0.5–0.8 mm long stipelike base, with perianth cream or rarely yellow, suffused with blush of pinkish-red to maroon, glabrous, or flowers 4–6 mm long, including a 1– 1.3 mm long stipelike base, with perianth pale yellow or rarely yellow, not suffused with blush of color glabrous, the tepals slightly dimorphic or monomorphic, broadly ovate or obovate, the stamens exserted, 3–5 mm long, the filaments pilose proximally; achenes light brown, (5) 5.5–8 mm long or 3–3.5 mm long, glabrous except for sparsely pubescent beak.
Eriogonum nudum var. westonii
Plants 3–6 dm tall; aerial flowering stems slender, 1–3 dm long, glabrous; leaves basal, the blades 1–2 cm long, 0.3–0.8 cm wide, tomentose abaxially, tomentose to floccose adaxially, the margins undulate-crisped; inflorescences umbellate or compactly cymose, 3–15 cm long, 3–20 cm wide, the branches glabrous; involucres 1–4 per cluster, 3–5 mm long, glabrous; flowers 2.5–3 mm long, the perianth yellow or, infrequently, white, pubescent.
Eriogonum saxatile
Plants herbs, loosely to densely matted, not scapose, (1) 2–4 dm tall, 0.5–2 dm across, densely white- or grayish-lanate to tomentose or floccose; stems spreading, often with persistent leaf bases, up to 1⁄4 height of plant, the caudex stems matted, decumbent to spreading, the aerial flowering stems spreading to erect, slender, solid, not fistulose, 0.5–1.5 dm long, lanate to tomentose or floccose; leaves basal or sheathing up stems 4 cm, 1 per node or fasciculate at tips of caudex branches, the proximal leaves with petioles 1–3 (4) cm long, tomentose and leaf blade obovate to rounded, 1–2 (2.5) cm long, 1–2 cm wide, lanate to tomentose, the distal leaves sessile and leaf blade elliptic to rounded, 0.3–1 cm long and wide, lanate to tomentose; inflorescences cymose, 10–25 cm long, 5–12 cm wide, the branches dichotomous, lanate to tomentose or floccose, the bracts 3–4, scalelike, triangular, 1.5–7 mm long; peduncles absent; involucres 1 per node, turbinate, 3–4 mm long, 2– 3 mm wide, tomentose to floccose, the teeth 5–6, erect, 0.8–1.5 mm long; flowers (3) 5–7 mm long, including an elongate, sharply triangular, slightly winged, stipelike base, the perianth white to rose or yellowish, glabrous, the hypanthium only at base of perianth, the tepals dimorphic, those of outer whorl oblanceolate to lanceolate, 3–5 mm long, 1.5–2 mm wide, those of inner whorl obovate, 4–6 mm long, 2–3 mm wide, the stamens included to slightly exserted, 2.5–5 mm long, the filaments pilose proximally; achenes trigonous, nearly winged, 3.5–4 mm long, glabrous. 2n = 40.
Eriogonum nudum var. auriculatum
Plants 5–15 (20) dm tall; aerial flowering stems occasionally fistulose, 2–5 (10) dm long, glabrous; leaves sheathing, the blades 3–7 cm long, 2–4 cm wide, tomentose abaxially, subglabrous or glabrous adaxially, the margins strongly undulate-crisped; inflorescences cymose, 30–100 (150) cm long, 10–80 cm wide, the branches glabrous; involucres (2) 3–5 per cluster, 3–4 mm long, glabrous or rarely sparsely pubescent; flowers 2.5–3 mm long, the perianth white to pink, rarely yellowish, glabrous or sparsely pubescent. 2n = 80.
Eriogonum eastwoodianum
Plants herbs, erect, 2–5 dm tall, tomentose, greenish-gray to gray; aerial flowering stems erect, (0.4) 0.8–1.5 dm long, tomentose; leaves basal, the petioles 2–8 cm long, tomentose, the blades suborbiculate, 1–3 cm long and wide, white-tomentose abaxially, subglabrous and greenish adaxially; inflorescences cymose, open, 10–40 cm long and wide, the branches tomentose, the bracts 1–5 (6) mm long, 1–2 mm wide; peduncles erect, straight, slender, 1–3.5 cm long, tomentose; involucres terminal at tips of slender branchlets at least proximally, not appressed to branches, turbinate, 2–2.5 mm long, 1.5–2 mm wide, tomentose, the teeth 5, erect, 0.6–0.9 mm long; flowers 1.5–2.5 (3) mm long, the perianth white, glabrous, the tepals monomorphic, elliptic to oblong-obovate, the stamens included, 0.7–1.2 mm long, the filaments usually pilose proximally; styles 0.1– 0.3 mm long; achenes brownish, trigonous, 1.6–2 (2.5) mm long; beak granular. 2n = 34.
Eriogonum shockleyi var. shockleyi
Plants herbs, matted, scapose, 0.3–0.5 (0.7) dm tall, (0.5) 1–4 (20) dm across, floccose to tomentose, greenish or grayish; stems matted, sometimes only seemingly so, with persistent leaf bases, up to 1/5 height of plant, the caudex stems matted, the aerial flowering stems absent or scapelike, erect or nearly so, slender, solid, not fistulose, (0.05) 0.1–0.3 dm long, floccose to tomentose; leaves basal, fasciculate in terminal tufts, the petioles 0.2–0.5 cm long, tomentose to floccose, the blades oblanceolate to elliptic or spatulate, (0.2) 0.3–0.8 (1.2) cm long, 0.2–0.4 (0.6) cm wide, tomentose to floccose, the margins plane or slightly thickened; inflorescences capitate, 0.8–2 cm long, the branches absent, the bracts 3–5, scalelike, linear to linear-lanceolate, 1.5–4 mm long, 0.6–1 mm wide; peduncles absent; involucres 2–4 (6) per cluster, campanulate, (2) 2.5–5 (6) mm long, 3–6 (7) mm wide, rigid, tomentose, the teeth 5–10, erect to spreading, (0.5) 1–3 mm long; flowers 2.5–4 mm long, the perianth white to rose or yellow, densely pilose, the hypanthium only at base of perianth, the tepals monomorphic, oblong to obovate, the stamens exserted, 2.5–5 mm long, the filaments subglabrous or sparsely pilose proximally; achenes light brown to brown, 2.5–3 mm long, tomentose.
- Involucral lobes 0.5–1.5 mm long; Great Basin and Snake River Plains : Eriogonum shockleyi var. shockleyi
- Involucral lobes 1.5–3 mm long; n Arizona and Colorado Plateau : Eriogonum shockleyi var. longilobum
Eriogonum shockleyi var. shockleyi: Leaf blades elliptic, 0.3–0.6 cm long, 0.3–0.5 cm wide, the aerial flowering stems absent or scapelike, (0) 0.5– 2 cm long; involucral lobes 0.5–1.5 (2) mm long, erect or nearly; flowers 2.5–4 mm long.
Flowering May-Aug. Common and widespread on gravelly or clayey (rarely sandy) flats, washes and slopes in mixed grasslands, saltbush, blackbrush and sagebrush communities, and in pinyon-juniper woodlands; (830) 1200–2600 m.
Eriogonum umbellatum var. aureum
Plants herbs, often rather compact mats, 1–3.5 dm tall, 2–6 dm across; aerial flowering stems erect, 1–2 (3) dm long, thinly floccose or glabrous, without one or more foliaceous bracts about midlength; leaves in loose rosettes, the blades usually elliptic, 1–2 cm long, 0.5–1.5 cm wide, glabrous on both surfaces (except in central Idaho, where sparsely floccose even at full maturity), the margins plane; inflorescences umbellate, the branches 0.3–2 (2.5) cm long, without a whorl of bracts about midlength; involucral tubes 1.8–3 mm long, the lobes 1–3 mm long; flowers 4–7 mm long, the perianth bright yellow. Continue reading
Eriogoneae 
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