PEA FAMILY 381 



3. GLEDfTSIA. Honey Locust. 



Trees, thorny with stout branching spines on branches and usually on 

 trunk: leaves abruptly pinnate, frequently bi-pinnate, and all gradations 

 often on same leaf: flowers in axillary, spicate racemes, greenish, inconspicu- 

 ous, some imperfect, not papilionaceous; calyx-tube short, 3-5 cleft; petals 

 3-5, nearly equal, inserted on calyx-tube; stamens 3-10, distinct, inserted on 

 petals: fruit a large, leathery, flat pod, elongated, containing 1 to many 



G. triacanthos, Linn. Large tree with hard and heavy wood: pods 6-18 

 in. long, an inch or so wide, twisted or hoop-like, filled with sweetish pulp 

 between the several to many smooth, shiny seeds. 



4. CERCIS. Redbud. 



Small trees with simple, rounded, heart-shaped leaves and tiny stipules 

 soon falling: flowers roseate-purple, in numerous small clusters along 

 branches, even on trunk, before leaves, thus giving the tree a striking 

 appearance; calyx 5-toothed, campanulate; corolla irregular, not papil- 

 ionaceous; petals 5 and standard inclosed by wings; stamens 10, distinct: 

 legume oblong, flat, many-seeded, margined on one edge. 



C. canadensis, Linn. Redbud. Judas tree. Native small tree of middle 

 and southern states, 10-30 ft. high, irregularly branching: bark smooth and 

 dark. Cultivated as ornamental tree, April, May. 



5. PiSUM. Pea. 



Slender herbs, climbing by tendrils which are homologous with leaflets: 

 leaves pinnate, with 1-3 pairs of foliar leaflets, and very large, leafy stipules: 

 lobes of calyx leafy; flowers large, white, or pink, on axillary peduncles: pod 

 a typical legume, several-seeded. 



P. sativum, Linn. Garden pea. Figs. 206, 310. Smooth and glaucous: leaf- 

 lets usually 2 pairs, broad-oval: peduncles 2- or more-flowered. Old World. 



6. LATHYRUS. Veitchling. 



Much like Pisum, differing chiefly in very technical characters, but best 

 told in general by the narrow leaflets and pods, and not leafy calyx. 



L. odoratus, Linn. Sweet pea. Figs. 177, 245. Annual, the stem hairy: 

 leaflets one pair, narrow-oval or oblong: flowers 2 or 3 on a long peduncle, 

 very fragrant, in many colors. Southern Europe. 



L. latifolius, Linn. Everlasting pea. Fig. 272. Perennial of long dura- 

 tion, smooth, the stems winged: leaflets one pair, long-oval: flowers many 

 in a dense cluster on long peduncles, rose-purple and white. Europe. 



7. VICIA. Vetch. Tahe. 



Herbs, mostly trailing or climbing by tendrils from the ends of pin- 

 nately compound leaves: leaflets usually many, entire or emarginate: 



stipules half -sagittate: flowers in axillary racemes or pairs; calyx somewhat 

 oblique, 5-toothed; wings adhering to keel; style slender, bent, hairy or with 

 hairy ring beneath stigma: pods flat, 2-valved, 2- to several-seeded. 



