FABACEAE 593 



times linear, acute : fruit subglobose, 7-8 mm. thick, silvery-canescent, spiny, its spines 

 barbed at the apex. 



In dry soil, Texas to California and Mexico. Spring. 



3. Krameria ramosissima (A. Gray) S. Wats. Shrubby, spiny, canescent. Stems 

 erect, 2-7 dm. tall, rigidly much branched ; branches spreading : leaf-blades linear, or 

 linear-lanceolate, 2-5 mm. long, often clustered in the axils, obtuse, sessile : peduncles 3-6 

 mm. long : pedicels about as long as the peduncles, subtended by 2 bracts : sepals lanceolate 

 or ovate-lanceolate, 6-8 mm; long : petals light maroon : fruit ovoid, 6-7 mm. long, silky, 

 the slender spines unarmed. 



In dry soil, Texas, New Mexico and adjacent Mexico. Spring. 



4. Krameria parvifolia Benth. Shrubby, silky -pubescent and somewhat glandular. 

 Stem erect, 2-7 dm. tall, rigid, diffusely branched ; branches spreading, sometimes spiny :. 

 leaves linear or nearly so, 0.5-1.5 cm. long, the lower ones obtuse, the upper spine-tipped, 

 sessile : peduncles 4-^8 mm. long : pedicels longer than the peduncles, subtended by 2: 

 bracts : sepals 7-9 ram. long, strigose and often slightly glandular : fruit subglobose, 

 cordate, 7-9 mm. long, the slender spines retrorsely barbed their whole length. 



In dry soil, Texas to California and Mexico. Spring. 



FAMILY 18. FABACEAE Keichenb. PEA FAMILY. 



Herbs, shrubs, vines or trees of vast and varied economic importance. Leaves 

 alternate : blades mostly compound, sometimes 1-foliolate, or probably simple, 

 occasionally perfoliate. Flowers perfect, or rarely polygamo-dioecious, solitary 

 or variously disposed in a simple or compound inflorescence, irregular. Calyx 

 of 4 or 5 partially united sepals, sometimes 2-lipped. Corolla papilionaceous, 

 hypogynous or perigynous. Petals 5, distinct or somewhat united, usually 

 separable into 3 kinds ; a broadened upper one surrounding the rest in the bud 

 (standard), 2 lateral ones (wings), and 2 united or cohering ones (keel). Androe- 

 cium of 10 or sometimes 9 or rarely 5 stamens. Filaments monadelphous, dia- 

 delphous or occasionally distinct. Gynoecium of a single carpel. Ovary 

 superior, 1-celled or 2-several-celled by cross partitions. Styles entire. Stigma 

 terminal, oblique or lateral. Ovules 1 or many, anatropous or amphitropous. 

 Fruit capsular, a 2-valved or indehiscent legume, or a loment. Seeds usually 

 destitute of endosperm. Embryo with thick cotyledons. [Papillonaceae L.] 



Stamens 10 : filaments distinct. 



Leaf-blades pinnate. TRIBE I. SOPHOREAE. 



Leaf-blades digitate! y 3-foliolate, 1-foliolate or simple. TRIBE II. PODALYRIEAE. 



Stamens 10 or fewer : filaments monadelphous or diadelphous. 

 Leaves destitute of tendrils. 



Herbs, shrubs, trees or woody vines. 



Fruit 2-valved or indehiscent, not a loment. 



Foliage not glandular-dotted (except in Glycyrrhiza). 



Anthers of 2 kinds : filaments monadelphous. TRIBE III. GENISTEAE. 



Anthers all alike : filaments diadelphous at least beyond 



the middle. 

 Leaf-blades 3-foliolate. 



Leaflets toothed. TRIBE IV. TRIFOLIEAE. 



Leaflets entire. TRIBE V. LOTEAE. 



Leaf-blades pmnately several-many-foliolate or 



rarely 1-foliolate. 



Pods dehiscent. TRIBE VI. GALEGEAE. 



Pods indehiscent. TRIBE VII. DALBERGIEAE. 



Foliage glandular-dotted. TRIBE VIII. PSORALEAE. 



Fruit a loment. TRIBE IX. HEDYSAREAE. 



Herbaceous vines or herbs. TRIBE X. PHASEOLEAE 



Leaves bearing tendrils. TRIBE XI. VICIEAE. 



TRIBE I. SOPHOREAE. 



Inflorescence racemose : pods moniliform. 1. SOPHORA. 



Inflorescence paniculate : pods flattened. 2. CLADRASTIS. 



TRIBE II. PODALYRIEAE. 



Ovary sessile or nearly so : pods flat. 3. THERMOPSIS. 



Ovary manifestly stalked : pods inflated or turgid. 4. BAPTISIA. 



TRIBE III. GENISTEAE. 



Stipules at least the upper ones decurrent : pods inflated. 5. CROTALARIA. 



Stipules not decurrent : pods flat. 6. LUPINUS. 



38 



