54. Leguminosae 131 



1. Stem 0.5-2 111 tall; leaves obovate, obtuse, 6-20 cm Ions;; calyx 

 glabrous; racemes many-flowered; seeds 4-5 mm in diameter; 

 roadsides and fields, s. 111. Sept. -Oct. Introd. from the tropics. 

 Alexander Co., H. M. Franklin in 1949 C. spectabilis Roth 



10. Lupinus L. — Lupine 

 L. perennis L. Sandy soil, locally in n. 111. May-June. 



1 1. Lotus L. — Bird's-loot Trefoil 

 L. corniculatus L. Widespread, perhaps in grass seed, becoming 

 fairly common in some places during the last twenty years; introd. 

 from Eur. June-Aug. 



12. Trifolium L. — Clover 

 1. Flowers white, purple, or pink. 



2. Flowers short-pedicelled, becoming reflexed in age. 



3. Heads 2.5-3 cm broad; plants annual or biennial; woods and 



fields, local. May-June. Buffalo Clover T. reflexum L. 



3. Heads less than 2.5 cm broad. 



4. Flowers white ; stems creeping and rooting, the peduncles 

 arising from near the ground; fields, roadsides, waste 

 places, lawns, open woods, common; nat. from Eur. 



May-June. White Clover T . repens L. 



4. Flowers pink or purple-tinged; stems erect or ascending 

 not rooting from the nodes; fields, roadsides, and waste 



places; nat. from Eur. June-Sept. Alsike Clover 



T. hybridum L. 



2. Flowers sessile or nearly so. 



5. Heads cylindrical; calyx-teeth plumose-pubescent. 



6. Corolla white, shorter than the calyx; gravelly soil, road- 

 sides, fields, or open woods; nat. from Eur. June-Sept. 

 Rabbit-foot Clover T. arvense L. 



6. Corolla crimson, longer than the calyx; cultivated and 



occasionally spontaneous in fields and waste places; 



introd. from Eur. June- July. Crimson Clover 



7". incarnaturn L. 



5. Heads subglobose to ovoid. 



7. Heads 2-3 cm in diameter; corolla magenta (or white), 



12-15 mm long; leaflets usually with a pale mark; plants 

 perennial; roadsides, fields, and waste places, common; 



nat. from Eur. May-Aug. Red Clover T. pratensc L. 



7. Heads smaller; corolla rose; calyx becoming inflated after 

 fruiting. 

 8. Corolla resupinate, so that the standard lies below ; plants 

 annual with ascending branches; waste ground, occa- 

 sional; introd. from Eur. May-Sept. Resupinate or 

 Persian Clover T. resupinatum L. 



