Trifolium angustifolium |
Trifolium obtusiflorum |
|
---|---|---|
narrow-leaf clover, narrow-leaf crimson clover |
clammy clover, creek clover |
|
Habit | Herbs annual, 10–30 cm, appressed-pubescent. | Herbs annual, 2–100 cm, resinous stipitate-glandular. |
Stems | erect, unbranched to sparsely branched. |
erect or ascending, branched. |
Leaves | palmate; stipules lanceolate to linear, 0.5–2.2 cm, margins entire, apex lanceolate-linear; petiole 2–3 cm; petiolules 1+ mm; leaflets 3, blades linear-lanceolate, 3–5 × 0.2–0.4 cm, base cuneate, veins fine, margins entire, apex acute, surfaces hairy. |
palmate; stipules ovate, 1–1.5 cm, sheathing, margins deeply lacerate, apex acuminate; petiole 1.5–10 cm; petiolules to 0.5 mm; leaflets 3, blades elliptic, lanceolate, oblanceolate, rhombic, or obovate, 1.5–4 × 0.3–1.7 cm, base cuneate, veins thickened, margins coarsely spinulose-serrate, apex acute, mucronate, surfaces glandular. |
Inflorescences | terminal, 25–75-flowered, spicate, cylindric or conic, 3–8 × 1.5–2 cm; involucres absent. |
axillary or terminal, 10–50-flowered, globose or ovoid, 1–3.5 × 1–3 cm; involucres flattened or bowl-shaped, 3–8 mm, when folded, not hiding flowers except proximally, incised 1/4–1/3 their length. |
Peduncles | 1–2.2 cm. |
3–15 cm, glandular. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
erect, 1 mm; bracteoles absent. |
Flowers | 10–13 mm; calyx tubular, 8–13 mm, tuberculate with appressed, stiff hairs, veins 10, tube 3–5 mm, lobes unequal, abaxial lobes longest, subulate-setaceous, spreading stellate in fruit, orifice closed by bilabiate callosities, hairy; corolla usually pale pink or purple, rarely white, 9–12 mm, banner ovate-elliptic, 9–12 × 2–2.5 mm, apex notched. |
13–20 mm; calyx tubular-campanulate, slit between adaxial lobes, 10–13 mm, glandular, veins 20+, tube 5–7 mm, lobes unequal, narrowly triangular or lanceolate-subulate, usually entire, rarely 3-fid or shouldered below apex, orifice open; corolla white or pale pinkish with dark purple spot, 10–18 mm, banner broadly elliptic, 10–18 × 2–4 mm, apex blunt. |
Legumes | ovoid, leathery distally, transversely dehiscent, 2.2–2.5 mm. |
obovoid, 3.5–4 mm. |
Seeds | 1, light brown or yellow, ovoid, 1.6–2 mm, smooth, glossy. |
1 or 2, brown, mottled, ellipsoid or mitten-shaped, 2.5 mm, smooth. |
2n | = 14, 16. |
= 16. |
Trifolium angustifolium |
Trifolium obtusiflorum |
|
Phenology | Flowering Mar–Apr. | Flowering Apr–Jul. |
Habitat | Waste places, fields, meadows. | Moist swales, creek bottoms. |
Elevation | 0–1000 m. (0–3300 ft.) | 0–1600 m. (0–5200 ft.) |
Distribution |
AL; CA; OR; SC; Europe; w Asia; n Africa; Atlantic Islands (Canary Islands) [Introduced in North America; introduced also in s South America (Chile, Uruguay), s Africa, Pacific Islands (New Zealand), Australia]
|
CA; OR; Mexico (Baja California, Sinaloa)
|
Discussion | Trifolium angustifolium is spreading rapidly in west-central California and is weedy in many regions globally (R. P. Randall 2002). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium obtusiflorum is much less common than the similar T. willdenovii, occurring in moist areas in cismontane California and north into Oregon (W. L. Jepson [1923–1925]). It is easy to distinguish from T. willdenovii by its glandularity, which causes fresh specimens to be sticky to the touch. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Synonyms | T. majus, T. roscidum, T. tridentatum var. obtusiflorum | |
Name authority | Linnaeus: Sp. Pl. 2: 769. (1753) | Hooker: Bot. Beechey Voy., 331. (1838) |
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