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Dimeresia howellii

dimeresia, doublet

Habit Herbs annual, cespitose, often acaulescent; taprooted.
Stems

0 or ? 3 cm; simple or with whorls of several branches, glabrous.

Leaves

basal and cauline, crowded, usually whorled below; opposite above, spatulate to lanceolate; ovate, or broadly elliptic, 4–35 mm;

margins entire;

tips acute to obtuse;

surfaces abaxially glabrous or lightly villous, sometimes obscurely punctate-glandular, sessile or petioles 1–12 mm.

Inflorescences

1–many heads in 1–10 dense clusters.

Involucres

cylindric to obconic, 4–6 × 2(4) mm.

Receptacles

minute;

paleae 0.

Florets

(1)2–3;

corolla tubes 1.5–2 mm, white or purple;

lobes 5, spreading, 0.5–2 mm, white or purple at base;

stamens partly or wholly exserted;

stigmas included.

Phyllaries

2–3 in 1 equal series; erect, deciduous in fruit, broadly elliptic or ovate, obscurely parallel-veined;

tips obtuse;

surfaces glabrous.

Fruits

cylindric or oblanceolate, tapering to base, flattened, truncate, 2.5–3 mm; black, glabrous, with 14–20 inconspicuous ribs, pappi of basally connate, plumose scales or flattened bristles, deciduous, 3–4 mm, white.

Heads

discoid; erect, sessile or peduncles 0–1 mm;

surfaces glabrous to woolly-villous.

2n

=14.

Dimeresia howellii

Asteraceae tribe heliantheae

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Rocky ridges, hillsides, talus slopes, sagebrush flats. Flowering May–Jul. 700–2800 m. BR, BW, ECas, Owy. CA, ID, NV. Native.

Source Flora of Oregon, volume 2, page 244
Kenton Chambers
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