— 
OF THE GENUS PINUS. 571 
** Leaves 2, semiterete, boat-shaped in section ; meri- 
stele elliptic in section; fibro-vascular bundle 
always branched. 
Section 9. SYLVESTREs. 
Cones subterminal or lateral. Resin-canals marginal. 
Spp. 53-62, 
Section 10. Pryasren. 
Cones lateral or subterminal. Resin-canals median. Spp. 63-7! 
Division I. TENUI SQUA! AME. 
Sect. I. Srropus. Spp. 1-10. 
} Cones sessile or nearly so; no dorsal stomata .... II. 
Cones distinctly stalked ...............0.. vee IID, 
Cones elongate-ovoid; scales oblong, flattish or slightly 
concave at the ends ............ 1. pentaphylla. 
II. ¢ Cones oblong-ovoid or subglobose ; scales rounded and 
very concave at the ends. Leaves 5-6 cent. 
2. parviflora. 
{ Cones very long, 20-80 cent. Young shoots covered with 
brownish hairs, Stomata on all sides of the leaf. 
Ill. ¢ 3. Lambertiana. 
Cones not exceeding 12-15 cent. Shoots glabrous, glaucous, 
. or purplish. Dorsal stomata absent ...... wee. IV; 
Cone-scales reflexed at the tips ...........66. weee OV, 
V. \Cone-seales not reflexed at the tips .......... eeee VIL 
Seed-wing shorter than the seed. Leaves 8-10 cent. 
4, strobiformis. 
| Seed-wing as long as the seed. Leaves 10-16 cent. 
5. Ayacuite. 
Cones short oblong ; scales roundish, wrinkled. 
VI. ! 6. scipioniformis. 
Cones elongate, cylindric-conic ........ weeeeeee WII. 
Cones curved, somewhat pointed ; scales rounded concave, 
nd and scoop-like at the tips; shoots ultimately glabrous, 
Leaves 8-10 cent. .......+.. sees . Strobus. 
Scales pointed, with a projecting muUCcTO........ VIII. 
Herbaceous shoot covered with brown felted hair, Leaves 
VIII. “ 4-10 cent. oc. cece ee eee eee ... 8 monticola. 
Shoots glabrous ... 26... see eee reer eet eee ees 
Cones oblong-ovoid, straight. Leaves 6-8 cent. 
9. Peuke. 
C ones elongate-c ‘ylindric, obtuse. often curve od. Leaves 10- 
V2 cent. poe cece eee eee ee 10, excelsa. 
