PEA FAMILY 
103 
linear or lanceolate, sharply serrate; heads 2.4 cm. broad or more; in¬ 
volucre laciniate, much shorter than the flowers; calyx-tube strongly 10- 
nerved, the lobes-usually 3-toothed; corolla bright purple, often tipped 
with white.—Hills and valley plains. 
11. T. variegatum Nutt. White-tip Clover. Stems decumbent or 
ascending; leaflets obovate to oblong-oblanceolate, spinulose-serrulate; in¬ 
volucre laciniate, shorter than the heads; heads 3 to 15-flowered, 1.2 cm. 
broad or less; calyx-tube 15-nerved, its teeth entire; corolla deep purple 
or whitish; pod 2-seeded.—Low moist ground. Var. melananthum 
Greene. Heads 2.4 broad.—Low wet ground. 
13. T. involucratum Ortega. Cow Clover. Stems decumbent, stout 
or even fistulous; leaflets obovate-oblong, denticulate; heads hemispheri¬ 
cal, 2.4 cm. broad; involucre laciniately cleft, the tooth-like segments 
awned; calyx-tube scarious, 10-nerved, the alternate nerves less promi¬ 
nent, the lobes entire or some toothed; corolla rose-red; banner elliptical, 
deeply notched.—Springy places and along streams. 
14. T. fucatum Lindl. Sour Clover. Stems stout and succulent, much 
branched, diffuse or decumbent; herbage glabrous; leaflets obovate to 
inversely deltoid, spinulose-serrate or nearly entire; heads 2.4 to 4.2 cm. 
broad; corolla cream-color, fading pinkish, 1.4 to 2 cm. long; keel-petals 
frequently with a dark-purple spot : pod with a rather long stipe.—Valley 
levels, especially in alkaline places. 
15. T. amplectens T. & G. Branches several from the base, decum¬ 
bent or ascending, 7.2 to 36 cm. long; leaflets oblong-obovate, serrulate 
mostly toward the apex; heads 6 to 12 mm. broad; bracts of the involucre 
5 to 7, ovate or oblong, 1.2 to 3.6 cm. long, commonly entire; corolla 
red-purple or whitish.—Valleys, alkaline plains or low hills. 
16. T. depauperatum Desv. Similar to no. 15 but smaller and in¬ 
volucre reduced to small truncate lobes or a minute ring; corolla white 
or purple.—Hill country. 
8. LOTUS L. 
Herbs or some woody at base. Leaves pinnate, of 1 to many leaflets. 
Flowers in umbels or solitary. Stamens in 2 sets (9 and 1). Pods flat¬ 
tened or terete, 2 to several-seeded. (A Greek name.) 
Flowers and pods erect or at least not reflexed ; pods dehiscent. 
Stipules large ; leaflets mostly equally distributed on the opposite sides of the 
rachis ; flowers in umbels ; banner yellow ; wings pink ; perennials. 
1. L. formosissimus. 
Stipules gland-like; leaflets commonly unequally distributed on the opposite 
sides of the rachis ; flowers solitary; annuals. 
Flowers in an elongated bracted peduncle. 
Corolla twice as long as the calyx; pods constricted between the 
seeds ; herbage glabrous.2. L. micranthus. 
Corolla scarcely exceeding the calyx ; pods not constricted ; herbage 
villous-pubescent.3. L. americanus. 
Flowers short-pediceled, not bracted ; corolla much exceeding the calyx. 
Calyx-teeth linear, much longer than the tube; pods oblong, 2 or 
3-seeded .-.4. L. humistratus. 
Calyx-teeth equalling the tube; pods linear, 5 to 7-seeded.. 
5. L. snbpinnatus. 
Flowers and pods reflexed; umbels sessile; stipules gland-like; pods with long and 
often curved points, 1 to 2-seeded, indehiscent.6. L. glaber.. 
