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Dimeresia howellii

dimeresia, doublet

dimeresia, doublet

Habit Annuals, 1–3(–5) cm.
Stems

decumbent to erect.

Leaves

blades (2–)10–30+ mm, initially cobwebby, glabrescent, often gland-dotted.

basal and/or cauline; opposite (crowded, seemingly whorled);

subsessile or ± petiolate;

blades spatulate to oblanceolate, entire.

Involucres

cylindric to obconic, 2(–4) mm diam.

Receptacles

minute, epaleate.

Ray florets

0.

Disc florets

2(–3), bisexual, fertile;

corollas white, pink, or purple, tubes slightly shorter than funnelform throats, lobes 5, deltate-ovate.

Corollas

5–6 mm.

Phyllaries

2(–3) in 1 series (basally distinct or connate, oblong, herbaceous).

Heads

discoid, in clusters (of 2–5, congested, total heads to 100+).

Cypselae

2–3 mm;

pappi 3–4 mm (bristles falling together).

cylindric to clavate, striate, glabrous;

pappi falling, of ca. 20 basally connate, setiform to subulate, ± plumose scales (or flattened bristles).

x

= 7.

2n

= 14.

Dimeresia howellii

Dimeresia

Phenology Flowering spring–summer.
Habitat Open gravelly or sandy places, talus slopes screes, serpentine
Elevation 1100–2900 m (3600–9500 ft)
Distribution
from FNA
CA; ID; NV; OR
[WildflowerSearch map]
[BONAP county map]
from USDA
w United States
[BONAP county map]
Discussion

Species 1.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 183. FNA vol. 21, p. 182. Author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Dimeresiinae > Dimeresia Asteraceae > tribe Heliantheae > subtribe Dimeresiinae
Subordinate taxa
D. howellii
Name authority A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 449. (1886) A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 448. (1886)
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