Tetraneuris torreyana |
Tetraneuris verdiensis |
|
---|---|---|
stone rubberweed, Torrey's four-nerve daisy |
verde four-nerve daisy |
|
Habit | Perennials, 2–15+ cm. | Perennials, 5–15+ cm. |
Caudices | ± branched, branches notably thickened distally. |
± branched, branches notably thickened distally. |
Stems | 1–30(–40), erect, unbranched. |
1–15, erect, unbranched. |
Leaves | all basal, new leaves tightly clustered; blades (midribs usually pronounced) spatulate or oblanceolate to linear-oblanceolate, entire, glabrous or usually sparsely, sometimes moderately to densely, hairy, densely gland-dotted. |
all basal (new leaves tightly clustered); blades obovate or oblanceolate to linear-oblanceolate, entire, densely hairy (not strigoso-canescent), ± gland-dotted. |
Peduncles | (0.5–)2–15 cm, ± hairy proximally, almost always densely lanate distally. |
4–15 cm, ± hairy. |
Involucres | 10–12 × 12–15 mm. |
5–9 × 6–10 mm. |
Ray florets | 7–14; corollas 11–17 mm. |
0. |
Disc florets | 25–150+; corollas yellow, 4–4.7 mm. |
20–40; corollas yellow, 2.5–4 mm. |
Outer phyllaries | 4–8, 6–8.5 mm, margins (0.3–)0.5–1.2 mm wide, usually conspicuously scarious, abaxial faces ± hairy. |
8–10, 4–5(–6) mm, margins 0–0.2 mm wide, sometimes slightly scarious, abaxial faces densely hairy. |
Heads | 1–10(–40) per plant, borne singly. |
1–15 per plant, borne singly. |
Cypselae | 3–4 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 3–4(–4.5) mm. |
2.8–4 mm; pappi of 5–6 ovate to lanceolate or obovate to oblanceolate, aristate scales 2.5–3.5 mm. |
Tetraneuris torreyana |
Tetraneuris verdiensis |
|
Phenology | Flowering May–Jun(–Sep). | Flowering May. |
Habitat | Roadsides, hillsides, slopes, open treeless areas, edges of woods | Low gypsum hills |
Elevation | (1300–)1700–3100 m ((4300–)5600–10200 ft) | ca. 1000 m (ca. 3300 ft) |
Distribution |
CO; MT; UT; WY
|
AZ |
Discussion | Of conservation concern. Tetraneuris verdiensis is found only at or near the type locality, east of Camp Verde, Yavapai County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 451. | FNA vol. 21, p. 450. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris |
Sibling taxa | ||
Synonyms | Actinella torreyana, Hymenoxys depressa, Hymenoxys lapidicola, Hymenoxys torreyana, T. depressa | |
Name authority | (Nuttall) Greene: Pittonia 3: 265. (1898) | R. A. Denham & B. L. Turner: Phytologia 81: 5, fig. 1. (1996) |
Web links |