Eriophyllum lanatum |
Eriophyllum mohavense |
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common woolly sunflower, Oregon sunshine, woolly eriophyllum, woolly sunflower, wooly sunflower |
Barstow woolly sunflower, Mohave or Barstow woolly sunflower, Mojave woolly sunflower |
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Habit | Perennials or subshrubs, 10–100 cm (sometimes flowering first year). | Annuals, 1–2.5 cm. | ||||||||||||||||||||||||||||||||||||||||||||
Stems | erect to decumbent (usually woolly). |
erect to spreading. |
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Leaves | (proximal usually alternate): blades mostly lanceolate to oblanceolate, 1–8 cm, often 1–2(–3)-pinnately lobed, ultimate margins toothed, serrate, or entire, revolute or plane, faces hairy, often woolly (more densely abaxially, sometimes glabrate adaxially; distal leaves reduced in size and lobing). |
blades spatulate to cuneate, 3.5–10 mm, sometimes 1–3-lobed (each lobe terminating in short, sharp cusp), ultimate margins entire, weakly, if at all, revolute (apices acute), faces loosely woolly. |
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Peduncles | mostly 3–30 cm. |
± 0.1 cm. |
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Involucres | campanulate to hemispheric, 6–15 mm diam. |
cylindric to obconic, 1–2+ mm diam. |
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Ray florets | 0 or 5–13(–15); laminae golden yellow to yellow, 6–20 (× 2–7) mm. |
0. |
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Disc florets | 20–300; corollas 2.5–5 mm (tubes usually glandular or glandular-hairy, glabrous in var. hallii). |
± 3; corollas ± 2 mm (tubes cylindric, throats broadly cylindric, abruptly dilated, lobes glandular; anther appendages deltate, tapering distally, not glandular). |
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Phyllaries | 5–13(–15), distinct or connate at bases (lanceolate to ovate, carinate or plane). |
3–4, distinct. |
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Heads | borne singly or (2–5+) in corymbiform arrays. |
borne singly or in clusters. |
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Cypselae | 2–5 mm; pappi usually of 6–12 ovate or cuneate to lanceolate or lance-linear (often unequal), erose or lacerate scales 0.3–2 mm, sometimes coroniform, rarely 0. |
2–2.5 mm; pappi of 12–14 linear to spatulate scales ± 1.5 mm. |
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Eriophyllum lanatum |
Eriophyllum mohavense |
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Phenology | Flowering Apr–May. | |||||||||||||||||||||||||||||||||||||||||||||
Habitat | Sandy or gravelly areas, creosote-bush scrublands | |||||||||||||||||||||||||||||||||||||||||||||
Elevation | 500–800 m (1600–2600 ft) | |||||||||||||||||||||||||||||||||||||||||||||
Distribution |
CA; ID; MT; NV; OR; UT; WA; WY; BC; Mexico (probably extinct)
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CA |
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Discussion | Varieties 10 (10 in the flora). Eriophyllum lanatum is a polyploid complex of intergrading regional facies treated here as varieties. Artificial hybridization studies show that strong barriers to interbreeding exist among the varieties at the diploid level (J. S. Mooring 2001). In nature, morphologically intermediate polyploid populations often occur in regions where the ranges of the varieties approach one another. Edaphic factors and light intensity also make identification more difficult by strongly influencing leaf morphology and sizes of structures. For example, cultivated individuals of var. achillioides may have laciniately toothed rather than pinnatifid leaves. Rarely, plants of different varieties maintain their identity while growing side by side. In some instances, one is diploid and the other tetraploid; in others both are diploid. Varieties arachnoideum, croceum, grandiflorum, and obovatum apparently form natural hybrids with E. confertiflorum var. confertiflorum; past hybridizations may have resulted in the origin of E. latilobum and E. jepsonii (L. Constance 1937; P. A. Munz 1959; Mooring 1994) and E. confertiflorum var. tanacetiflorum (Mooring 1994). Our treatment of Eriophyllum lanatum closely follows that of L. Constance (1937), which was done without benefit of cytogeographic studies. The key is to modal populations of the varieties, usually based on living plants. Some varieties have been introduced into cultivation as ornamentals. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 357. | FNA vol. 21, p. 355. | ||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Baeriinae > Eriophyllum | Asteraceae > tribe Heliantheae > subtribe Baeriinae > Eriophyllum | ||||||||||||||||||||||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||||||||||||||||||||||||||
Synonyms | Actinella lanata | Eremonanus mohavensis | ||||||||||||||||||||||||||||||||||||||||||||
Name authority | (Pursh) J. Forbes: Hort. Woburn., 183. (1833) | (I. M. Johnston) Jepson: Man. Fl. Pl. Calif., 1117. (1925) | ||||||||||||||||||||||||||||||||||||||||||||
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