Plants herbs, erect, infrequently polygamodioecious, 2–4 (7) dm tall, 2–5 dm across; floccose or glabrous; stems with caudex spreading, the aerial flowering stems erect, slender or stout, hollow, often slightly fistulose, arising at nodes of caudex branches and at distal nodes of short, nonflowering aerial branches, 1–5 dm long, floccose or glabrous; leaves basal, occasionally in rosettes, the petioles 4–10 (15) cm long, tomentose, the blades lanceolate or ovate to deltoid, (2) 7–25 cm long, (0.7) 1–8 cm wide, densely white-lanate to tomentose abaxially, less so to glabrate and greenish adaxially, the margins entire, plane; inflorescences umbellate or compound-umbellate, 3–20 cm long and wide, the branches floccose or glabrous, the bracts 3–several, foliaceous or semi-foliaceous at proximal nodes, linear to linear-lanceolate, 1–3 (6) cm long, scalelike distally, usually 1–5 mm long, 0.5–3 mm wide; involucres 1 per node, turbinate-campanulate to campanulate, 6–10 mm long, 4–10 mm wide, sparsely to densely lanate, weakly glandular-puberulent, or glabrous, the teeth (5) 7– 10, usually not lobelike, erect to weakly reflexed, 2–4 mm long; flowers 5–6 mm long, including a 0.7–1.5 mm long stipelike base, the perianth pale to bright yellow, occasionally ochroleucous, glabrous, the tepals monomorphic, oblong to oblong-ovate, the stamens slightly exserted, 4–8 mm long, the filaments pilose proximally; achenes light brown, 5–6 mm long, glabrous except for sparsely pubescent beak.
Author Archives: xochipelli2012
Eriogonum nudum var. pubiflorum
Plants 3–8 (10) dm tall; aerial flowering stems not fistulose, 1–3 dm long, glabrous; leaves basal, the blades 1–4 cm long, 0.5–2 cm wide, tomentose abaxially, floccose or glabrous adaxially, the margins plane; inflorescences cymose, 20–70 cm long, 20–40 cm wide, the branches glabrous; involucres 2–7 per cluster, 3–5 mm long, glabrous or sparsely pubescent; flowers 2.5–3 mm long, the perianth white or, infrequently, yellow, pubescent. 2n = 40. Continue reading
Eriogonum umbellatum var. modocense
Plants herbs, mats, 1–3.5 (4) dm tall, 1–3 (5) dm across; aerial flowering stems erect, 0.7–2.5 dm long, usually tomentose, without one or more foliaceous bracts about midlength; leaves in somewhat compact rosettes, the blades usually elliptic, (0.3) 1–1.5 (2) cm long, 0.1–1 (1.2) cm wide, densely tomentose abaxially, mostly glabrous and green adaxially, the margins plane; inflorescences umbellate, the branches 3–10 (15) cm long, usually tomentose, without a whorl of bracts about midlength; involucral tubes 2–3 mm long, the lobes 2–3 mm long; flowers 4–8 mm long, the perianth bright yellow.
Eriogonum sphaerocephalum var. halimioides
Plants subshrubs, spreading to erect, infrequently polygamodioecious, 0.5–4 dm tall, 3–5 (6) dm across, floccose or glabrous; 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, (0.3) 0.5–1 dm long, thinly floccose or glabrous, with a whorl of 4–8 foliaceous bracts about midlength or proximally, linear-oblanceolate to oblanceolate, 1–2 cm long, 0.1–0.4 cm wide; leaves in loose to congested basal rosettes, the petioles 0.05–0.3 cm long, floccose or glabrous, the blades linear-oblanceolate, narrowly oblanceolate, or narrowly spatulate, 1–3 (4) cm long, (0.1) 0.3–0.6 (1) cm wide, lanate or tomentose to floccose or glabrous, the margins entire, plane or revolute; inflorescences capitate, compound-umbellate, or umbellate, 1–2 cm wide or 1–5 cm long and wide, the branches thinly floccose or glabrous, the bracts absent immediately below involucre; involucres 1 per node, turbinate-campanulate to campanulate, 3–4 mm long, 2.5–4.5 mm wide, the teeth 6–10, lobelike, slightly reflexed, 1.5–3 (5) mm long; flowers (5) 6–9 mm long, including a 1–2 mm long stipelike base, the perianth pale to bright yellow or cream to ochroleucous, villous abaxially, the tepals monomorphic, obovate to oblong-ovate, the stamens exserted, 4–6 mm long, the filaments pilose proximally; achenes light brown, 3–4 mm long, glabrous except for sparsely pubescent beak.
Eriogonum rosense var. rosense
Plants herbs, matted, scapose, 0.2–1 (1.3) dm tall, 0.5–5 dm across; stems matted, with persistent leaf bases, up to 1/5 height of plant, the caudex stems matted, the aerial flowering stems scapelike, weakly erect to erect, slender, solid, not fistulose, 0.1–0.9 (1.1) dm long, densely glandular-hairy; leaves basal, fasciculate in terminal tufts, the petioles 0.4–2 cm long, tomentose, sometimes also glandular, the blades oblanceolate or broadly elliptic to oval, 0.4–2.5 cm long, (0.15) 0.25–1.6 cm wide, densely white-tomentose and glandular on both surfaces or densely white-tomentose abaxially and greenish-tomentose adaxially, the margins plane; inflorescences capitate, 0.6–1.5 cm long, the branches absent, the bracts 3, scalelike, triangular, 1–3.5 mm long; peduncles absent; involucres 3–6 per cluster, turbinate to campanulate, (2.5) 3–5 (6) mm long, 2.5–4 (6) mm wide, rigid, glandular and sparsely hairy, the teeth 5–8, erect, 0.7–1.4 mm long; flowers 2–4 mm long, the perianth bright yellow to reddish-yellow, occasionally cream, glabrous or glandular, the hypanthium only at base of perianth, the tepals monomorphic, obovate or oblong, the stamens exserted, 3–5.5 mm long, the filaments glabrous or sparsely pilose proximally; achenes light brown, 1.5–3.5 mm long, glabrous.
Eriogonum ochrocephalum
Plants herbs, matted, scapose, 0.5–4.5 dm tall, 0.5–3 dm across; stems matted or spreading, occasionally with persistent leaf bases, up to 1/5 height of plant, the caudex stems matted or absent, the aerial flowering stems erect or nearly so, slender, solid, not fistulose, (0.5) 1.5–4.5 dm long, glabrous, rarely slightly floccose, or glandular below inflorescence; leaves basal, fasciculate in terminal tufts, sheathing up stem 1–4 cm, the petioles 1–4 cm long, tomentose, the blades oblanceolate to elliptic or ovate to obovate, 1–2 cm long, (0.3) 0.5–1 (1.5) cm wide, densely tomentose abaxially, only slightly less so adaxially, the margins plane; inflorescences capitate, 1.5–2.5 cm long, the branches absent, the bracts 3, scalelike, narrowly triangular, 1– 2.5 mm long; peduncles absent; involucres 5–8 per cluster, turbinate-campanulate to campanulate, 3–4.5 (5) mm long, (1.5) 2–4.5 mm wide, rigid, sparsely to densely floccose, occasionally glandular, the teeth 6–8, erect, 0.5–1 mm long; flowers 2–2.5 (3) mm long, the perianth yellow, glabrous or weakly glandular abaxially, the hypanthium only at base of perianth, the tepals monomorphic, broadly oblong, the stamens exserted, 2.5–3.5 mm long, the filaments pilose proximally; achenes light brown, 1.5–2.5 mm long, glabrous.
Eriogonum ovalifolium var. williamsiae
Plants 1–5 dm wide; leaf blades broadly elliptic to oval or reniform, 0.3–0.7 cm usually white-tomentose, the margins almost never not brownish; scapes erect, (1) 5–15 (18) cm long, tomentose; inflorescences capitate, 1–2 cm wide, the branches absent; involucres 3–10 per cluster, 4–5 mm long; flowers 4–5 mm long, the perianth white. Continue reading
Eriogonum diatomaceum
Plants herbs, matted or slightly spreading, scapose, 0.5–2 dm tall, 0.5–2.5 dm across; stems spreading, with persistent leaf bases, up to 1⁄4 height of plant, the caudex stems matted or slightly spreading, the aerial flowering stems erect, slender, solid, not fistulose, (0.4) 0.5–1.5 (2) dm long, tomentose; leaves sheathing up flowering stem (1.5) 2–4 cm, 1 per node, fasciculate in terminal tufts on stemless caudex branches, the petioles (0.3) 0.5–1.5 (1.8) cm long, tomentose, the blades elliptic, (0.5) 0.8–2 (2.3) cm long, (0.3) 0.5–1.2 (1.8) cm wide, densely grayish-tomentose on both surfaces, the margins plane; inflorescences capitate, 1–1.5 cm wide, the branches absent, the bracts 3–8, elongate-triangular to triangular, scalelike, 1–3 mm long, tomentose; peduncles absent; involucres 5–10 per cluster, turbinate, (2.5) 3–4.5 mm long, 2–3 mm wide, rigid, tomentose, the teeth 5–7, erect, 0.6–1 mm long; flowers (1.5) 2.5–3 mm long, the perianth creamy white, glabrous, the hypanthium 1⁄3–1⁄2 length of perianth, the tepals monomorphic, oblong-ovate, the stamens exserted, 3–3.5 mm long, the filaments sparsely pilose proximally; achenes light brown, 2–2.5 mm long, glabrous.
Eriogonum umbellatum var. humistratum
Plants herbs, prostrate mats, 0.7–2 dm tall, 1–3 dm across; aerial flowering stems erect or nearly so, 0.5–1.5 dm long, floccose, without one or more foliaceous bracts about midlength; leaves in rather compact rosettes, the blades broadly elliptic, 0.5–1 (1.5) cm long, 0.5–1 cm wide, densely white-tomentose on both surfaces or slightly less so adaxially; inflorescences umbellate, the branches (2) 2.5–5 cm long, floccose, without a whorl of bracts about midlength; involucral tubes 1.5–2 mm long, the lobes 1.5–3 mm long; flowers 3–6 mm long, the perianth bright yellow.
Eriogonum umbellatum var. nelsoniorum
Plants subshrubs or herbs, spreading, 1–2.5 dm tall, 2–7 dm across; aerial flowering stems erect, 1–2 dm long, thinly floccose, without one or more foliaceous bracts about midlength; leaves in rather loose rosettes, the blades elliptic to oblong, (0.5) 1–1.5 (2) cm long, 0.4–0.8 cm wide, densely white-tomentose to lanate abaxially, white-tomentose to floccose or rarely glabrate and greenish adaxially, the margins plane; inflorescences umbellate, 1–3 cm long, the branches 1–2 cm long, thinly floccose, without a whorl of bracts about midlength; involucral tubes 3–4 mm long, the lobes 2–4 mm long; flowers (5) 6–7 mm long, the perianth bright yellow.
Eriogoneae 
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