154 LEGUMINOSAE. 
CARAGANA. 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. 0. mollis. Bosemann, 
46. OC. 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. 
