Difference between revisions of "Doellingeria umbellata"
Gen. Sp. Aster., 178. 1832.
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|name=Diplostephium umbellatum | |name=Diplostephium umbellatum | ||
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|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Doellingeria | |genus=Doellingeria | ||
Revision as of 15:25, 18 September 2019
Plants 50–200 cm (short to long-rhizomatous, sometime colonial). Stems 1–10(–20), ascending to erect, striate, glabrous or sparsely hairy. Cauline leaves: mid and distal crowded, blades broadly to narrowly elliptic, (35–)60–110(–150) × (5–) 13–25(–35) mm, ± reduced distally, not stiff, bases attenuate, margins entire, involute, finely ciliate, apices acuminate, faces glabrous or sparsely hairy, especially along veins abaxially, or densely hairy. Heads (3–)20–100(–300+). Peduncles 1–10 mm, moderately to densely canescent; bracts linear-lanceolate to elliptic. Involucres 3–5 mm. Phyllaries in 3–4 series, triangular-lanceolate, midveins not swollen, apices finely subulate, strigose. Rays (2–)5–10(–16); laminae (4–)7–10(–12.3) × (0.8–) 1.2–1.8(–2.7) mm. Disc florets (5–)11–26(–50); corollas 3.5–6 mm, lobes 2–3.2 mm, 60–75% of limb. Cypselae 1.4–3.2 mm, 4–6-ribbed, sparsely to densely strigose; pappi: outer 0.2–0.8 mm, inner 3.5–6.2 mm. 2n = 18.
Distribution
e North America.
Discussion
Varieties 2 (2 in the flora).
Selected References
None.
Key
| 1 | Leaves: abaxial faces sparsely piloso-villous (fewer than 10 hairs/mm 2); Newfoundland to Minnesota, s to n Alabama and Georgia | Doellingeria umbellata var. umbellata |
| 1 | Leaves: abaxial faces densely puberulent (more than 12 hairs/mm 2); n Ontario, s Manitoba (disjunct to Alberta) s to Nebraska, Iowa, Illinois | Doellingeria umbellata var. pubens |