154 



LEGUMINOSAE. 



CAEAGANA. Pea Tree. 

 (Family Leguminosae). 



Shrubs, exceptionally subarbo- 

 rescent or grafted as standards; 

 somewhat spiny: deciduous. Twigs 

 moderate or rather slender: an- 

 gled from the nodes: pith moder- 

 ate, somewhat angular, continu- 

 ous. Buds small or moderate, ap- 

 parently solitary, sessile, with 3 

 or 4 exposed scales. Leaf-scars 

 alternate, much raised, minute, 

 half-round or the leaf-rachis per- 

 sistent as a spine or leaving a 

 round scar if this falls: bundle- 

 trace 1: stipules persistent, often 

 pungent. 



Winter-character references: 

 Caragana altanga. Bosemann, 46. 

 C. arborescens. Bosemann, 46; 

 Schneider, f. 134. C. frutescens. 

 Bosemann, 46. C. mollis. Bosemann, 

 46. C. spinosa. Schneider, f. 134. 



1. Stipules not pungent: spine falling. (1). C. frutex. 

 Stipules and rachis both spinescent. 2. 



Stipules very pungent: rachis falling. 4. 



2. Twigs slender (1-2 mm.). 3. 



Twigs coarse, with many subglobose spurs. C. spinosa. 



3. Leaflet-scars crowded near end of the spine. C. pygmaea. 

 Two scars near the middle of the spine. (2). C. Chamlagu. 



4. Buds small: bark exfoliating. (3). C. decorticans. 

 Buds relatively large (4-6 mm. long). 5. 



5. Stipule-spines short (3-4 mm.). (4). C. microphylla. 

 Stipule-spines moderate or long (5-10 mm.). 6. 



6. Twigs, spines and buds green or olive. C. arborescens. 

 Twigs, spines and buds dull red. (5). C. Boisii. 



