FABACEAE 



597 



3. Thermopsia fraxinifolia (Nutt.) M. A. Curtis. Foliage glabrous or nearly so. 

 Stems 3-9 dm. tall, widely branching : stipules linear to linear-lanceolate : leaflets 3, the 

 blades oblanceolate to elliptic, oval or lanceolate, obtuse or acute, often mucronulate : 

 racemes 1-3 dm. long, loosely flowered : pedicels 1-1.5 cm. long, subtended by linear or 

 lanceolate bracts : calyx campanulate ; lobes acuminate, less than as long as the tube : 

 corolla yellow ; keel-petals 12-15 mm. long ; standard with a suborbicular notched blade 

 fully 1 cm. broad : pods linear, 5-10 cm. long, long-acuminate. 



On dry mountain sides, North Carolina to Georgia. Spring and summer. 



4. Thermopsis Carolinlana M. A. Curtis. Foliage glabrous or nearly so. Stems 

 6-15 dm. tall, wand-like, more or less zigzag : stipules oblong, ovate or oblong, obtuse, clasp- 

 ing : leaflets 3, the blades oblanceolate to oblong-elliptic, 3-10 cm. long, obtuse or mucron- 

 ulate, more or less pubescent beneath : racemes terminal, 1-3 dm. long, erect, lanuginous : 

 pedicels stout, 1-3 mm. long, subtended by broad acute bracts : calyx campanulate, 7-8 

 mm. long ; lobes triangular, less than ^ as long as the tube : corolla yellow ; keel-petals 

 15-20 mm. long ; standard with a reniform-orbicular notched blade fully 1 cm. broad : 

 pods linear, 4-6 cm. long, tomentose, slender-beaked. 



On river banks, North Carolina to Tennessee and Georgia. Spring. 



4. BAPTl'siA Vent. 



Perennial herbs, with large rootstocks and erect stems. Leaves alternate. Blades 

 digitately 3-foliolate or sometimes simple : leaflets with entire blades commonly broadest 

 above the middle. Flowers perfect, in terminal or lateral, simple or branched racemes 

 or axillary. Calyx pedicelled : lobes nearly equal or the 2 upper wholly united. Corolla 

 white, cream -colored, yellow or blue : standard broad, spreading, the sides reflexed : 

 wings oblong or broadened upward : keel slightly curved, about as long as the wings. 

 Stamens 10, distinct : anthers similar. Ovary stipitate. Style slightly incurved. Ovules 

 several or numerous. Pod cylindric or subglobose, more or less inflated, stalked. WILD 

 INDIGO. 



Leaf-blades simple, rarely lobed : stipules wanting. 



Leaves with perfoliate blades : inflorescence axillary. 1. B. perfoliata. 



Leaves with merely sessile blades : inflorescence racemose. 2. B. simplicifolia. 



Leaf-blades 3-foliolate : stipules present. 



Upper leaflets and stipules more or less united : stipules persistent. 3. B. microphylla. 



Upper leaflets, like the rest, distinct : stipules mostly deciduous or fugacious. 

 Flower-stalk distinguished into peduncle and pedicel. 

 Foliage glabrous or minutely pubescent. 



Calyx-lobes triangular, about as long as the tube. 4. B. LeContei. 



Calyx-lobes spatulate, several times longer than the tube. 5. B. calycosa 



Foliage copiously hirsute. 6. B. hirsuta. 



Flower-stalk not distinguished into peduncle and pedicel. 

 Racemes terminal, often leafy bracted at least to the base. 

 Corolla less than 1.5 cm. long. 



Pods with oval or oblong bodies gradually beaked. 7. B. tinctoria. 



Pods with globular bodies abruptly beaked. 8. B. Gibbesii. 



Corolla over 1.5 cm. long. 



Terminal leaflets broadest above the middle. 



Leaflets 5-6 times as long as broad. 9. B. lanceolata. 



Leaflets about twice as long as broad. 10. B. Nuttalliana. 



Terminal leaflets broadest at the middle, more or less distinctly 



rhombic. 11. B. elliptica. 



Racemes opposite leaves, naked or with small bracts. 

 Corolla yellow. 



Pods subglobose, with thick and hard walls. 12. B. sphaerocarpa. 



Pods more or less elongated, with thin walls. 



Pods conspicuously acuminate. 9 13. B. villosa. 



Pods blunt and apiculate or abruptly pointed. 



Stipules persistent. 14. B. sulphured. 



Stipules deciduous. 



Corollas over 1.5 cm. long : pods about 2 cm. thick. 15. B. megacarpa. 



Corollas less than 1.5 cm. long : pods less than 1 cm. thick. 16. P. Serenae. 

 Corolla of various colors, not yellow. 

 A. Corolla white or cream-colored. 



Racemes naked, or with minute or obsolute bracts. 

 Corolla less than 1.5 cm. long. 



Racemes mostly longer than the peduncles : pedicels'gla- 

 brous: lower calyx-lobes triangular : corolla less than 

 1.5 cm. long. 17. B. alba. 



Racemes mostly shorter than the peduncles : pedicels pu- 

 bescent : lower calyx-lobes ovate : corolla over 1.5 cm. 

 long. 18. B. albescent. 



Corolla over 1.5 cm. long. 19. B. leucantha. 



Racemes with manifest, sometimes almost leaf-like, bracts, 

 a. Pedicels mainly less than 1.5 cm. long. 



