132 7 LEGUMINOS2. > MELILOTUS. 
TRIFOLIUM. 
grant flowers in slender axillary racemes. Calyx tubular or 
campanulate, 5-toothed, persistent. Corolla deciduous, the upper 
petal free, longer than the lateral ones, keel petals completely 
united cohering with the lateral ones, all free from the stamens. 
Stamens diadelphous. Style filiform. Pods coriaceous, globose 
or ovoid, longer than the calyx, scarcely dehiscent, one to few- 
seeded. | 
M. Invica All. Fl. Ped. i, 303. M. parviflora Desv. Stems erect or as- 
cending, with spreading branches, 1-3 feet high, from an annual root: 
leaflets of the lower leaves obovate a.id often nearly entire, of the upper 
ones cuneate-oblong or linear, truncate or emarginate, serrate; stipules 
linear-setaceous; racemes at first dense, at length rather loose; flowers 
yellow, small; teeth of the calyx broad, nearly equal, half the length of 
the corolla; petals nearly equal: pods globose-ovate, wrinkled, 2-seeded. 
In low grounds and along rivers. Introduced. 
M. aupa. Lam. Encycel, iv, 63. Stems erect, branching, 3-6 feet high, 
from a biennial root: leaflets ovate-oblong, truncate at the apex, mucro- 
nate, remotely serrate; stipules setaceous: racemes elongated, panicled, 
loose; teeth of the calyx unequal, as long as the tube; corolla white, 2-3 
lines long, more than twice the length of the calyx, the upper petal longer 
than the others: pods ovate, wrinkled, two-seeded. Along streams and 
river bottoms. Introduced. 
7 TRIFOLIUM Tourn. Inst. t. 228, L. Gen. n, 896. (CLover). 
Herbs with palmately or pinnately trifoliolate, rarely 5-7-folio- 
late, leaves with adnate stipules, and usually numerous flowers 
in capitate racemes, spikes or umbels, on axillary or apparently 
terminal peduncles. Calyx 5-cleft or -parted, with nearly equal 
teeth, persistent. Petals persistent, unguiculate, the claws all 
more or less adnate to the staminal tube, or the upper one free: 
keel short, obtuse. Stamens diadelpnous. Pods concealed with- 
in or little exserted from the calyx, 1—-6-seeded, dehiscent or in- 
dehiscent. 
§ 1. Lupryaster Monch. DC. Prodr. ii, 203. Heads not in- 
voluerate, dense: leaflets 5-7, rarely only 3; flowers sessile :teeth 
of the calyx nearly equal, filiform, plumose: perennials. 
T. megacephalum Nutt. Gen. ii, 105 (?). Stems stout, 4-8 inches 
long, from a stout perennial root, decumbent or ascending, villous, 1-2- 
leaved below, and a pair of opposite ones at the summit; stipules folia- 
ceous, the lower ones lanceolate to oblong, irregularly incised with acumi- 
_ nate lobes, to almost entire, the pair subtending the peduncle obliquely 
ovate, 6-8 lines long by 4-6 lines broad, laciniately lobed and toothed; 
leaflets 5-7, obovate to oblanceolate, 4-10 lines long, spinulose-dentate, 
apiculate, obtuse or emarginate, strongly veined: peduncle stout, appar- 
ently terminal, longer than the leaves: flowers many, in dense capitate 
spikes, very shortly pediceled, an inch or more long, ochroleucous and pur- 
ple: tube of the calyx 1-2 lines long, the setaceous F oaecarteg teeth 5-6 
times longer; upper petal broad, free, longer than, and enfolding the oth- 
ers, wings and keel unguiculate, the claws adnate to the staminal tube: 
pods sessile, ciliate near the apex, otherwise smooth, 4-6-ovuled, usually 
2-seeded. In wet gravelly places, Eastern Oregon and Washington. 
T. Plummere Watson Bot. Cal.ii, 440 (?). Stems cespitose, 1-3 inches 
high, clustered at the crown of a thick perpendicular root, canescent with 
