Flora of North America species comparison

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Aphanostephus riddellii

Riddell's dozedaisy, Riddell's lazydaisy
Habit Perennials, 10–40(–50) cm (caudices usually woody, stems 1–5+); vestiture sparsely hispidulous to puberulent, stem hairs spreading to deflexed or antrorse, 0.2–0.5 mm.
Ray florets

30–75.
Disc floret

corollas: bases indurate, not conspicuously swollen.
Cypselae

hairs apically glochidiate;

pappi coroniform, minutely ciliate or lacerate, 0.1–0.3 mm.
Phyllary

apices long-acuminate.
2n

= 10, 20.

Aphanostephus riddellii
Phenology Flowering Mar–Aug(–Oct).
Habitat Open sites, often calcareous, often with scrubby oaks
Elevation 100–500 m (300–1600 ft)
Distribution
from FNA
NM; TX; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
Discussion

Aphanostephus riddellii is the only perennial in the genus. The caudex usually is woody, bearing numerous stems. The distal cauline leaves (upper half of stem) usually are linear, the basal and proximal cauline are conspicuously broader, spatulate, and dentate to pinnatifid. In other species, distal leaves usually are more similar to proximal.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 352.
Parent taxa Asteraceae > tribe Astereae > Aphanostephus
Sibling taxa
A. pilosus, A. ramosissimus, A. skirrhobasis
Name authority Torrey & A. Gray: Fl. N. Amer. 2: 189. (1842)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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