Trifolium ciliolatum |
Trifolium macrocephalum |
|
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foothill clover |
big-headed clover, largehead clover |
|
Habit | Plants annual, erect, 5–50 cm, glabrous or sparsely hairy; branched. | Plants perennial, erect or ascending, 5–25 cm, villous; branched. |
Leaves | palmate; leaflets 3, elliptic to oblong or obovate, 8–35 × 5–15 mm, bases cuneate; margins serrate proximally, obscurely denticulate distally; veins thickened; tips usually rounded or retuse, rarely acute; surfaces glabrous; petioles 10–130 mm; petiolules ~0.5 mm; stipules ovate-lanceolate, 10–15 mm; margins entire, sometimes ciliate; tips acuminate. |
palmate; leaflets (5)7–9, broadly to narrowly obovate, often folded, 10–27 × 4–11 mm, bases cuneate; margins serrulate or irregularly lobed; veins thickened, especially distally; tips rounded or truncate, apiculate; surfaces abaxially villous, adaxially sparsely villous to glabrate; petioles 10–140 mm; petiolules 0.9–1.2 mm; stipules ovate, obovate, or oblong, 10–30 mm; margins entire. |
Inflorescences | axillary or terminal, 10–30-flowered; ovoid becoming subglobose, 7–22 × 5–20 mm; involucres a narrow, membranous, dentate rim; ~0.5 mm; bracteoles linear or cup-shaped; ? 1 mm. |
terminal, 20–32-flowered, globose or ovoid-ellipsoidal, 25–80 × 30–70 mm; involucres absent; bracteoles broadly ovate, membranous; ? 0.5 mm, truncate. |
Peduncles | 25–120 mm. |
20–80 mm. |
Pedicels | erect but becoming reflexed, 0.5–6 mm. |
erect, 1–1.5 mm. |
Flowers | 6–13 mm; calyces broadly campanulate, 5–11 mm, glabrous; veins 10; tubes 1–5 mm; lobes elliptic to linear, unequal; margins hyaline, markedly ciliate, dentate or pectinate; sinuses narrow; orifices open; corollas 5–13 mm, white, pink, or purple; banners broadly ovate, 6–13 × 4–7 mm; tips rounded, apiculate. |
20–30 mm; calyces campanulate, 10–22 mm, villous; veins 10–15; tubes 2.5–4 mm; lobes subulate, subequal, 2–4 × tube length, plumose; orifices open; corollas 20–28 mm, white; creamy white, or pinkish; banners ovate or oblong, 20–28 × 10–13 mm; tips rounded or slightly emarginate; keel petals deep pink. |
Fruits | longitudinally dehiscent; ovoid, 5–10 mm; < 2 × as long as calyces; short-stipitate. |
longitudinally dehiscent; ovoid, 4–5 mm; ? calyces. |
Seeds | 1–2; ovoid, 2.5–3 mm, brown, mottled; smooth. |
1–2; mitten-shaped to ellipsoid, 2.5–3 mm, yellow or reddish; smooth. |
2n | =16. |
=32, 48. |
Trifolium ciliolatum |
Trifolium macrocephalum |
|
Distribution | ||
Discussion | Oak-pine chaparral, meadows, roadsides. Flowering May–Jun. 50–800 m. Col, ECas, Sisk, WV. CA, WA; south to Mexico. Native. |
Rocky places, hard, compacted clay gumbo, lava beds, sage-covered slopes. Flowering Apr–Jul. 0–2200 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA. Native. Trifolium macrocephalum has the largest inflorescences of any species in the genus. The name T. megacephalum is an illegitimate replacement name for Lupinaster macrocephalum. |
Source | Flora of Oregon, volume 2, page 725 Michael Vincent |
Flora of Oregon, volume 2, page 734 Michael Vincent |
Sibling taxa | ||
Web links |