120 rOUNDATIONS OF BOTANY 



1. D. brachylobus, Benth. Desmanthus. Stem erect or ascend- 

 ing, smooth, 1-4 ft. high. Pinnse 6-14 pairs, each with a minute 

 gland at the base ; leaflets 20-30 pairs, small, linear. Heads glo- 

 bose. Stamens 5. Pods several, on a peduncle 2-3 in. long, curved, 

 flat, 2-valved, 3-6-seeded. Open, sandy fields.* 



n. SCHRAWKIA, Willd. 



Perennial herbs ; stems reclining or prostrate, prickly, 2-6 

 ft, long. Leaves twice-pinnate ; stipules bristly. Flowers 

 perfect or somewhat monoecious, in axillary peduneled heads. 

 Calyx minute. Corolla tubular, 5-cleft. Stamens 8-10, dis- 

 tinct. Pod long, prickly, 1-celled.* 



1. S. uncinata, Willd. Sensitive Brier, Sensitive Rose, 

 Shame Vine. Plant covered with hooked prickles. Leaflets ellip- 

 tical, with a conspicuous network of veins beneath; leaves closing 

 gradually after being touched. Flowers rose-colored. Pods nearly 

 cylindrical, 2 in. long. Dry, sandy soil and rolling prairies, espe- 

 cially S. and W. 



in. CERCIS, L. 



Trees. Leaves simple with stipules. Flowers in axillary 

 clusters, papilionaceous. Calyx bell-shaped, 5-toothed. Sta- 

 mens 10, distinct. Ovary short-stalked ; ovules several. 

 Fruit a flattened pod. 



1. C. canadensis, L. Redbud. A smaR tree, 10-20 ft. high, wood 

 hard but weak, bark smooth, dark-colored. Leaves broadly cordate, 

 abruptly acute, rather thick, very smooth above, often slightly 

 downy below. Flowers several in a cluster, appearing before the 

 leaves, pinkish-purple. Pod oblong, compressed, many-seeded. Com- 

 mon on rich soil, especially S.* 



IV. GYMHOCLADTJS, Lam. 



A large, thornless tree, its twigs few and stout. Leaves 

 very large, twice pinnately compound, without stipules. 

 Flowers regular, whitish, dioecious or somewhat monoecious, 

 in racemes at the ends of the branches. Calyx-tube rather 

 long, its 5 lobes spreading. Petals oblong, all alike, inserted 

 with the stamens on the throat of the calyx. Stamens of 

 the fertile flowers usually not pollen-bearing. Pod hard, flat, 



