Tetraneuris ivesiana |
Tetraneuris torreyana |
|
---|---|---|
Ives' four-nerve-daisy |
stone rubberweed, Torrey's four-nerve daisy |
|
Habit | Perennials, 10–26+ cm. | Perennials, 2–15+ cm. |
Caudices | ± branched, branches notably thickened distally. |
± branched, branches notably thickened distally. |
Stems | (1–)5–20(–30), erect, leafy, ± branched distally. |
1–30(–40), erect, unbranched. |
Leaves | basal and cauline, entire, glabrous or sparsely to moderately lanuginose to sericeous, usually densely gland-dotted; basal leaves tightly clustered, blades linear-oblanceolate; proximal cauline blades linear-oblanceolate; mid blades linear-oblanceolate to linear, 1.7–2 mm wide; distal blades linear-oblanceolate 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 | 5–18.5 cm, ± hairy, usually densely hairy distally. |
(0.5–)2–15 cm, ± hairy proximally, almost always densely lanate distally. |
Involucres | 8–12 × 13–17 mm. |
10–12 × 12–15 mm. |
Ray florets | 7–10; corollas 10–20 mm. |
7–14; corollas 11–17 mm. |
Disc florets | (40–)80–150+; corollas yellow, 3.3–4.5 mm. |
25–150+; corollas yellow, 4–4.7 mm. |
Outer phyllaries | 7–12, 5–6.4 mm, margins 0–0.3(–0.4) mm wide, usually scarious, abaxial faces ± hairy. |
4–8, 6–8.5 mm, margins (0.3–)0.5–1.2 mm wide, usually conspicuously scarious, abaxial faces ± hairy. |
Heads | (1–)5–30(–40) per plant (1–5 per stem), borne singly or in paniculiform to corymbiform arrays. |
1–10(–40) per plant, borne singly. |
Cypselae | 3–4.1 mm; pappi of 5–7 lanceolate or obovate to oblanceolate, aristate scales 2.7–4.5 mm. |
3–4 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 3–4(–4.5) mm. |
2n | = 28, 30, 56, 60. |
|
Tetraneuris ivesiana |
Tetraneuris torreyana |
|
Phenology | Flowering Apr–Aug. | Flowering May–Jun(–Sep). |
Habitat | Roadsides, hillsides, open treeless areas, edges of woods | Roadsides, hillsides, slopes, open treeless areas, edges of woods |
Elevation | 1300–2900 m (4300–9500 ft) | (1300–)1700–3100 m ((4300–)5600–10200 ft) |
Distribution |
AZ; CO; NM; UT
|
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 | Hymenoxys acaulis var. ivesiana, Hymenoxys argentea var. ivesiana, Hymenoxys ivesiana, T. intermedia, T. mancosensis, T. pilosa | Actinella torreyana, Hymenoxys depressa, Hymenoxys lapidicola, Hymenoxys torreyana, T. depressa |
Name authority | Greene: Pittonia 3: 269. (1898) | (Nuttall) Greene: Pittonia 3: 265. (1898) |
Web links |