Palafoxia arida |
Palafoxia sphacelata |
|
---|---|---|
desert palafox, Spanish needle |
othake, ray palafoxia |
|
Habit | Annuals, 10–200 cm. | Annuals, 10–90 cm. |
Stems | scabrous to nearly glabrous, sometimes distally stipitate-glandular. |
usually proximally hispid, distally stipitate-glandular. |
Leaf | blades lance-linear to linear, 20–120 × 2–55 mm. |
blades broadly to narrowly lanceolate, 30–90 × 3–20 mm. |
Involucres | cylindric to narrowly turbinate. |
broadly to narrowly turbinate. |
Ray florets | 0. |
3–5; corollas 15–25 mm, laminae 5–12 mm. |
Disc florets | 9–40; corollas ± actinomorphic, 9–13 mm, throats ± cylindric, longer than lobes. |
15–35; corollas ± actinomorphic, 10–14 mm, throats ± funnelform, shorter than lobes. |
Phyllaries | ± equal, 10–25 × 1–2.5 mm, ± scabrous, sometimes stipitate-glandular. |
9–12+ × 1.5–3 mm, ± equal, ± scabrous to hispid and/or stipitate-glandular. |
Cypselae | 10–16 mm; pappus scales of inner cypselae 8–12 mm. |
6–9 mm; pappus scales of inner cypselae 7–9 mm. |
2n | = 24. |
= 24. |
Palafoxia arida |
Palafoxia sphacelata |
|
Phenology | Flowering late winter–spring(–summer). | Flowering summer–fall. |
Habitat | Sandy soils | Sandy soils |
Elevation | 30–1000 m (100–3300 ft) | 1000–1800 m (3300–5900 ft) |
Distribution |
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
|
CO; KS; NE; NM; OK; TX; Mexico (Chihuahua)
|
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.) |
|
Source | FNA vol. 21, p. 390. | FNA vol. 21, p. 389. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia |
Sibling taxa | ||
Synonyms | P. arida var. gigantea | Stevia sphacelata |
Name authority | B. L. Turner & M. I. Morris: Madroño 23: 79. (1975) | (Nuttall ex Torrey) Cory: Rhodora 48: 86. (1946) |
Web links |