Flora of North America species comparison

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Hymenothrix loomisii

Hymenothrix wislizeni

Loomis' thimblehead

trans-Pecos thimblehead
Habit Annuals or biennials, 30–70 cm. Annuals, 30–70 cm.
Disc florets

10–20;

corollas creamy to bright yellow, mostly 4–4.5 mm, lobe lengths 0.3–1 times throats;

anthers yellowish.

15–30;

corollas creamy to bright yellow, mostly 5–7 mm, lobe lengths 0.3–1 times throats;

anthers yellowish.
Phyllaries

8(–12), mostly linear to narrowly oblanceolate.

8(–12), mostly linear to narrowly oblanceolate.
Cypselae

2.5–4+ mm;

pappus scales 3–5 mm.

3–5 mm;

pappus scales 1.5–6 mm.
Rays

0.

3–8.
2n

= 24.

= 24, 48.

Hymenothrix loomisii

Hymenothrix wislizeni
Phenology Flowering summer–fall. Flowering summer–fall.
Habitat Open, often disturbed, places Open slopes and washes, sandy or gravelly soils
Elevation 900–2100 m (3000–6900 ft) 600–1500 m (2000–4900 ft)
Distribution
from FNA
AZ; CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Occurrences of Hymenothrix loomisii in California have been geographically scattered, sporadic, and nonpersistent introductions.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 387. FNA vol. 21, p. 387.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Hymenothrix Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Hymenothrix
Sibling taxa
H. wislizeni, H. wrightii
H. loomisii, H. wrightii
Name authority S. F. Blake: Proc. Biol. Soc. Wash. 40: 49. (1927) A. Gray: Mem. Amer. Acad. Arts, n. s. 4: 102. (1849)
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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