Palafoxia arida |
Palafoxia callosa |
|
---|---|---|
desert palafox, Spanish needle |
small palafox, small palafoxia |
|
Habit | Annuals, 10–200 cm. | Annuals, 20–60 cm. |
Stems | scabrous to nearly glabrous, sometimes distally stipitate-glandular. |
scabrous to glabrate, not stipitate-glandular. |
Leaf | blades lance-linear to linear, 20–120 × 2–55 mm. |
blades linear, 20–70 × 1–4 mm. |
Involucres | cylindric to narrowly turbinate. |
± turbinate. |
Ray florets | 0. |
0. |
Disc florets | 9–40; corollas ± actinomorphic, 9–13 mm, throats ± cylindric, longer than lobes. |
5–30; corollas actinomorphic, 5–6 mm, throats ± funnelform, shorter than lobes. |
Phyllaries | ± equal, 10–25 × 1–2.5 mm, ± scabrous, sometimes stipitate-glandular. |
3–5 × 1+ mm, ± equal, ± strigillose, not stipitate-glandular. |
Cypselae | 10–16 mm; pappus scales of inner cypselae 8–12 mm. |
3–5 mm; pappus scales of inner cypselae 0.3–1 mm. |
2n | = 24. |
= 20. |
Palafoxia arida |
Palafoxia callosa |
|
Phenology | Flowering late winter–spring(–summer). | Flowering summer–fall. |
Habitat | Sandy soils | Rocky, calcareous soils |
Elevation | 30–1000 m (100–3300 ft) | 50–300 m (200–1000 ft) |
Distribution |
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
|
AR; MO; TX; Mexico (Coahuila)
|
Discussion | Plants of Palafoxia arida 90–150 cm with phyllaries 16–25 mm (from dunes west of Yuma, Arizona) have been treated as var. gigantea. Plants referable to P. arida have been named P. linearis (Cavanilles) Lagasca (including var. gigantea M. E. Jones) in other floras; P. linearis is a Mexican species (see B. L. Turner and M. I. Morris 1976). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Some depauperate specimens of Palafoxia rosea (e.g., Oklahoma, Beckham Co., 17 Oct 1936, Eskero 1502, US) closely resemble P. callosa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 390. | FNA vol. 21, p. 390. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia |
Sibling taxa | ||
Synonyms | P. arida var. gigantea | Stevia callosa |
Name authority | B. L. Turner & M. I. Morris: Madroño 23: 79. (1975) | (Nuttall) Torrey & A. Gray: Fl. N. Amer. 2: 369. (1842) |
Web links |