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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
from FNA
CO; MT; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ
[BONAP county map]
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
T. acaulis, T. argentea, T. herbacea, T. ivesiana, T. linearifolia, T. scaposa, T. turneri, T. verdiensis
T. acaulis, T. argentea, T. herbacea, T. ivesiana, T. linearifolia, T. scaposa, T. torreyana, T. turneri
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)
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