LEGUMINOSAE. 



157 



ROBINIA. LOCUSt. 



(Family Leguminosae). 



Trees or shrubs: deciduous. 

 Wood hard, yellow or brown, ring- 

 porous. Twigs zig-zag, more or 

 less angled: pith round, continu- 

 ous, brown. Buds small, super- 

 posed beneath a membrane left 

 after leaf-fall, the end-bud lack- 

 ing. Leaf-scars alternate, broadly 

 triangular or 3-lobed, consisting 

 of a membrane that splits open 

 later: bundle-traces 3. Stipules 

 bristle- or prickle-like. 



Winter-character references: 

 Robinia hispida. Blakeslee & 

 Jarvis, 522; Bosemann, 47; Bren- 

 del, 28; Hitchcock (1), 4, (3), 12; 

 Otis, 168; Schneider, f. 67; Shira- 

 sawa, 230, pi. 1; Ward, 1:197, f. 

 99; Willkomm, 36, 41, f. 68. R. 

 viscosa. Blakeslee & Jarvis, 522; 

 Bosemann, 47; Schneider, f. 139. 



A note on the stipular spines of RoMnia is to be found 

 under Zanthoxylum. 



1. Trees. 2. 

 Shrubs. 4 



2. Twigs glandular. 

 Twigs not glandular. 3. 



3. With spines. (Black locust). 

 Unarmed. 



4. Twigs both viscid and bristly. 

 Twigs without viscid glands. 5. 



5. Twigs very bristly. (Rose acacia). (3). R. hispida. 

 Twigs not bristly. R. Kelseyi. 



(1). R. viscosa. 



(2). R. Pseudacacia. 



R. Pseudacacia inermis. 



R. neo-mexicana. 



