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woolly clover

thimble clover

Habit Plants annual, erect or ascending, 6–35 cm, villous or glabrous; branched.
Leaves

palmate;

leaflets 3, obovate or obcordate, 4–14 × 3–12 mm, bases cuneate;

margins serrate;

veins fine, thickened distally;

tips rounded or emarginate;

surfaces villous or glabrous;

petioles 10–80 mm;

petiolules ~0.5 mm;

stipules obliquely ovate, 4–12 mm;

margins entire, toothed, or lacerate;

tips acuminate.

Inflorescences

axillary or terminal, 10–17-flowered, subglobose, 8–17 × 5–15 mm;

involucres cup-shaped;

bracts ± connate, 5–15 mm, glabrous or inconspicuously hairy;

lobes 8–12; ovate, conspicuously sharply toothed;

bracteoles absent.

Peduncles

15–74 mm.

Pedicels

absent.

Flowers

6–7 mm;

calyces tubular-campanulate, 3–4 mm, glabrous;

veins 10;

tubes 2.5–3.5 mm;

lobes triangular; ± equal, not or minutely aristate, conspicuously toothed;

margins membranous;

orifices open;

corollas 6–9 mm, pale pink or white;

banners oblong, 6–9 × 2–3 mm;

tips narrowly rounded or emarginate-mucronate.

Fruits

ovoid, 2–3 mm.

Seeds

1–2, oblong, 1.5–2 mm; greenish, sometimes mottled; smooth.

2n

=16.

Trifolium tomentosum

Trifolium microdon

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Meadows, roadsides, dry slopes, fields, open oak or pine forests. Flowering Apr–Jul. 0–1000 m. CR, Est, Sisk, WV. CA, ID, WA; north to British Columbia, south to Mexico; South America. Native.

Trifolium microdon is one of several taxa in the genus that have an apparently natural disjunct distribution between the western coast of South America (Chile) and western North America. Others include T. depauperatum var. depauperatum and T. macraei.

Source Flora of Oregon, volume 2, page 735
Michael Vincent
Sibling taxa
T. albopurpureum, T. angustifolium, T. appendiculatum, T. arvense, T. aureum, T. barbigerum, T. beckwithii, T. bifidum, T. breweri, T. campestre, T. cernuum, T. ciliolatum, T. cyathiferum, T. depauperatum, T. dichotomum, T. douglasii, T. dubium, T. echinatum, T. eriocephalum, T. fragiferum, T. fucatum, T. glomeratum, T. gymnocarpon, T. hirtum, T. howellii, T. hybridum, T. incarnatum, T. latifolium, T. leibergii, T. longipes, T. macraei, T. macrocephalum, T. microcephalum, T. microdon, T. obtusiflorum, T. oliganthum, T. owyheense, T. plumosum, T. pratense, T. productum, T. repens, T. resupinatum, T. retusum, T. siskiyouense, T. striatum, T. subterraneum, T. suffocatum, T. variegatum, T. vesiculosum, T. willdenovii, T. wormskioldii
T. albopurpureum, T. angustifolium, T. appendiculatum, T. arvense, T. aureum, T. barbigerum, T. beckwithii, T. bifidum, T. breweri, T. campestre, T. cernuum, T. ciliolatum, T. cyathiferum, T. depauperatum, T. dichotomum, T. douglasii, T. dubium, T. echinatum, T. eriocephalum, T. fragiferum, T. fucatum, T. glomeratum, T. gymnocarpon, T. hirtum, T. howellii, T. hybridum, T. incarnatum, T. latifolium, T. leibergii, T. longipes, T. macraei, T. macrocephalum, T. microcephalum, T. obtusiflorum, T. oliganthum, T. owyheense, T. plumosum, T. pratense, T. productum, T. repens, T. resupinatum, T. retusum, T. siskiyouense, T. striatum, T. subterraneum, T. suffocatum, T. tomentosum, T. variegatum, T. vesiculosum, T. willdenovii, T. wormskioldii
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