128 KEY AND FLORA 
c 
Herbs or trees. Flowers decidedly papilionaceous. The upper petal ex- 
ternal in bud and inclosing the others. Stamens 10, not united to each 
other. 
Trees. Cladrastis, VIT 
Herbs. Pod inflated. Baptisia, VI 
Herbs. Pod elongated, necklace-shaped. Sophora, VIII 
D 
Shrubs with a corolla of one petal only. Amorpha, XVI 
E 
Herbs, shrubs, or trees. Flowers decidedly papilionaceous. Stamens 
monadelphous or diadelphous (in the latter case usually 9 and 1). 
1. Stamens with anthers of two forms. 
(a) Herbs. Leaves usually with many leaflets. Lupinus, IX 
(5) Herbs. Leaves with 38 entire leaflets. Psoralea, XV 
(c) Trees. * Laburnum, X 
(d) Low shrubs. Cytisus, XI 
2. Anthers all alike. Leaves usually with 3 leaflets. 
(a) Pod coiled. Medicago, XIV 
(6) Pod small, not coiled. Flowers in racemes. 
Melilotus, XIII 
(c) Pod small, not coiled. Flowers in heads. Trifolium, XII 
(d) Pod large, flattened, bur-like. Desmodium, XX 
(e) Pod large, not much flattened. Phaseolus, XXIV 
8. Anthers all alike. Leaves odd-pinnate, with more than 3 
leaflets. 
(a) Low, woody shrubs. Amorpha, XVI 
(b) Tall, twining shrubs. Wisteria, XVIII 
(c) Trees. Robinia, XVII 
(d) Herbs. Astragalus, XTX 
4. Anthers all alike. Leaves pinnate, the midrib prolonged into 
a tendril. 
