KEY TO THE FAMILIES AND GENERA 



95 



cc. Calyx bilabiate, the upper lip larger, 



entire or 2-lobed or 2-parted 72. Canamlia. 



BB. Standard-stamen free or connate only at 

 the base. 



c. Calyx 4-lobed 73. Galactia. 



cc. Calyx not 4-lobed. 



D. Infl. usually racemose, the rachis of the 



raceme jointed. 

 E. Standard much larger than the 



wings and keel 74. Erythrina. 



EB. Standard smaller than the keel. 

 F. Pod 2-valved. 



a. Anthers of 2 kinds 75. Mucuna. 



GO. Anthers uniform 76. Apios. 



FF. Pod not dehiscent, except at the 



top 77. Butea, 



DD. Infi. sometimes racemose but the 



rachis of the raceme not jointed. 

 E. Lva., especially beneath, with mi- 

 nute resinous dots: infl. racemose 

 or subumbellate or the fls. solitary. 



F. Ovules 2 78. Flemingia. 



FF. Ovules 4 or more. 



G. Pod turgid; seeds strophiolate. . . 79. Fagelia. 

 GO. Pod compressed; seeds not stro- 

 phiolate 80. Cajanus. 



EE. Lvs. without minute resinous dots: 

 fls. clustered or racemose in the 

 axils, solitary or twin along the 

 rachis. 



F. Fls. showy; standard large, flat- 

 tened out; bracts persistent 81. Centroaema. 



FF. Fls. medium-sized; standard, 

 erect, complicate, sides often 



reflexed: bracts persistent 82. Amphi- 



FFF. Fls. small {showy in Kennedya); [carpxa. 



standard spreading or reflexed; 

 bracts persistent or small and 

 deciduous. 



G. Seeds not strophiolate 83. Glycine. 



GO. Seeds strophiolate. 



H. The fls. small; keel usually 



much smaller than wings 84. Harden- 



HH. The fls. showy; keel usually [bergia 



equaling or surpassing the 

 wings 85. Kennedya. 



13. Trifolium Tribe. 



A. Standard-stamen connate with the others 



into a closed tube ; keel beaked 86. Onont*. 



AA. Standard-stamen free; keel obtuse or in Paro- 



chetus acutish. 



B. Lfts. digitate (rarely pinnate in Trifolium). 

 c. Pod 2-valved: keel acutish; petals not 



adnate 87. Parochetus 



cc. Pod usually indehiscent: claws of all or 

 the lower petals adnate to the stamina! 



tube 88. Trifolium. 



BB. Lfts. 3, pinnate. 



c. Pod straight, sickle-shaped or arched, 

 sometimes thick and beaked, some- 

 times linear, sometimes broad and flat, 

 indehiscent or folliculately gaping or 



rarely 2-valved 89. Trigonella. 



cc. Pod spirally falcate, circinnate or 



cochleate 90. Medicago. 



ccc. Pod small, subglobose or ovoid, thick, in- 

 dehiscent or tardily 2-valved 91. Melilotus. 



14. Galega Tribe. 



A. Connective of the anthers appendaged with a 

 small gland or mucro: ovules mostly o, 1-2 



in a few species; pod 2-valved 92. Indigofera. 



AA. Connective not appendaged. 



B. Ovules 1-2, rarely 3-4. (See also BB.) 



c. Number of ovules 1 93. Psoralea. 



cc. Number of ovules 2, rarely 3-4. 



D. Stamens 10 94. Amorpka. 



DD. Stamens 5 95. Petaloste- 



BB. Ovules oo (1-2 in a few species of Teph- [mon. 



rosia). 



c. Infl. terminal or opposite the Ivs., mostly 

 racemose (in Galega both axillary and 

 terminal, in some Tephrosias axillary): 

 pod 2-valved. 



D. Style longitudinally bearded on the 

 inner side; calyx long-tubular; petals 



very long-clawed 96. Barbieria. 



DD. Style glabrous (or merely penicillate 



at the stigma in some tephrosias). 

 B. Standard-stamen connate with the 



rest from the base 97. Galena. 



XK. Standard-stamen free or connate 

 with the others from the middle. 



F. The pod narrow or short, with 

 slender valves and nervifonn or 



hardly thickened sutures 98. Tephrosia. 



FF. The pod thick, leathery or woody, 

 a. Pod usually tardily dehiscent: 



infl. mostly panioled 99. Millttia. 



GO. Pod easily dehiscent: infl. race- 

 mose 100. Wistaria. 



cc. Infl. axillary, except where noted below. 

 D. Pod flat, except where the seeds finally 



make it turgid 101. Robinia. 



DD. Pod inflated, turgid or terete, longitudi- 

 nally septate or undivided, rarely 

 flat and when so always longitudi- 

 nally septate. 

 E. Styles variously bearded above 



F. Petals acuminate 102. Clianthut. 



FT. Petals not acuminate. 



o. Standard erect 103. Suther- 



GG. Standard spreading or reflexed. [landia. 



H. Stigma small 104. Swainsona. 



HH. Stigma prominent 105. Colutea. 



EE. Style not bearded. 



F. Lvs. even-pinnate: shrubs or trees. 

 G. The pod stipitate, obovoid or 



oblong 106. Halimoden~ 



[dron. 



GO. The pod linear, usually acute 107. Caragana. 



FF. Lvs. odd-pinnate or wit.h a spiny 



petiole instead of an odd 1ft. 

 G. Anther-cells confluent at apex. . . 108. Glycyrrh- 

 GG. Anthers uniform. [iza. 

 H. Petals not all narrow, the 

 standard obovate or orbicu- 

 lar 109. Calopkaca. 



HH. Petals narrow. 



i. Keel blunt 110. Astragalus. 



u. Keel acute 111. Oxytropit. 



15. Bauhinia Tribe. 



A. Petals erect or spreading, only slightly 



unequal 112. Bauhinia. 



AA. Petals falsely pea-like, the standard inmost.. . . 113. Cercis. 



16. Amherstia Tribe. 



A. The petals absent; sepals 4 114. Saraca. 



AA. The petals present. 



B. Bractlets persistent, inclosing the bud. 



c. Petals 5, slightly unequal 115. Brownea. 



cc. Petals unequal, 1 very wide, 2 narrow, 



2 minute and rudimentary 116. Amherstia. 



BB. Bractlets small or deciduous. 



c. Lfts. 1 pair 117. Hymenxa. 



cc. Lfts. 2 or more pairs. 



D. Petals 5, 3 perfect, 2 rudimentary 118. Tamarin- 



[dus. 

 DD. Petals 5, slightly unequal 119. Schotia. 



17. Caesalpinia Tribe. 



A. Calyx-lobes strongly imbricate; disk-bearing 

 tube short: seed not albuminous. 



B. Pod indehiscent: stigma peltate 120. PeUoph- 



[orum. 



BB. Pod 2-valved : stigma not peltate 121. Cn-salpinia. 



AA. Calyx-tube long, or top-shaped or bell-shaped; 

 segms. short or narrow and open: seeds, 

 when known, albuminous. 



B. Pod turgid or subterete 122. Gymnoc- 



[ladus. 



BB. Pod flattish 123. Gleditsia. 



AAA. Calyx-segms. valvate. 



B. Segms. 4, the upper ones connate; highest 



petal widest, lowest narrow 124. Cohillea. 



BB. Segms. 5; petals roundish, about equal 125. Poinciana. 



AAAA. Calyx-segms. slightly imbricate or valvate: 

 seeds albuminous. 



B. Ovary ad B ate to calyx-tube 126. Schizolotf 



[turn, 



BB. Ovary free in bottom of calyx 127. Parkin- 



[sonia. 



18. Cassia Tribe. 



A. Petals 5; fls. hermaphrodite 128. Cassia. 



AA, Petals 0; fls. polygamous 129. Ceratonia. 



The following genera also are described as having more or less 

 horticultural interest: Afzelia, Amicia, Aotus, Baikiffia, Baphia 

 Brachysema, Camdensia, Carmichffilia, Cicer, Copaifera, Dalea 



Piptanthus, Podalyria, Pterocarpus, Pterolobium, Rhynchosia 

 Scorpiurus, Sesbania. Toluifera, Vouapa. 



