Tetraneuris argentea |
Tetraneuris torreyana |
|
---|---|---|
perkysue |
stone rubberweed, Torrey's four-nerve daisy |
|
Habit | Perennials, 6–25(–42+) cm. | Perennials, 2–15+ cm. |
Caudices | ± branched, branches notably thickened distally. |
± branched, branches notably thickened distally. |
Stems | 1–8(–12), erect, leafy, ± branched distally. |
1–30(–40), erect, unbranched. |
Leaves | basal and cauline, entire, usually densely strigoso-canescent, ± gland-dotted; basal leaves tightly clustered, blades spatulate to oblanceolate; proximal cauline blades oblanceolate; mid blades oblanceolate to linear-oblanceolate, 2.5–5 mm wide; distal blades linear-lanceolate to linear. |
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. |
Peduncles | 2–13.5 cm, usually densely hairy. |
(0.5–)2–15 cm, ± hairy proximally, almost always densely lanate distally. |
Involucres | (5–)7–10 × 8–15 mm. |
10–12 × 12–15 mm. |
Ray florets | 8–14; corollas 11.8–17 mm. |
7–14; corollas 11–17 mm. |
Disc florets | 25–75(–100+); corollas yellow proximally, yellow or rarely purplish distally, 2.8–3.8 mm. |
25–150+; corollas yellow, 4–4.7 mm. |
Outer phyllaries | 8–11, 4–6.5 mm, margins 0–0.3 mm wide, usually scarious, abaxial faces densely hairy. |
4–8, 6–8.5 mm, margins (0.3–)0.5–1.2 mm wide, usually conspicuously scarious, abaxial faces ± hairy. |
Heads | 1–10(–30) per plant (1–7 per stem), borne singly or in paniculiform to corymbiform arrays. |
1–10(–40) per plant, borne singly. |
Cypselae | 2.4–3.1 mm; pappi of 5–6 obovate, aristate scales 2.1–3.5 mm. |
3–4 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 3–4(–4.5) mm. |
2n | = 30, 60. |
|
Tetraneuris argentea |
Tetraneuris torreyana |
|
Phenology | Flowering (Apr–)May–Aug(–Sep). | Flowering May–Jun(–Sep). |
Habitat | Roadsides, hillsides, open treeless areas, edges of woods | Roadsides, hillsides, slopes, open treeless areas, edges of woods |
Elevation | (1500–)2000–2400(–3000) m ((4900–)6600–7900(–9800) ft) | (1300–)1700–3100 m ((4300–)5600–10200 ft) |
Distribution |
AZ; NM
|
CO; MT; UT; WY
|
Source | FNA vol. 21, p. 450. | FNA vol. 21, p. 451. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Tetraneuris |
Sibling taxa | ||
Synonyms | Actinella argentea, Hymenoxys argentea, T. formosa, T. leptoclada, T. trinervata | Actinella torreyana, Hymenoxys depressa, Hymenoxys lapidicola, Hymenoxys torreyana, T. depressa |
Name authority | (A. Gray) Greene: Pittonia 3: 269. (1898) | (Nuttall) Greene: Pittonia 3: 265. (1898) |
Web links |