76 



TRANS. ST. LOUIS ACAD. SCIENCE. 



§ 2. Cembr.'K. Ducts parenchymatous; leaves sparingly serrulate, 

 scarcely denticulate at tip. — Europe and principally Asia. 

 P. Cembra,^ Mandschurica, Koraiensis. 



Sect. II. PINASTER. Apophysis with a dorsal umbo, mostly armed, 

 generally thicker; leaves i to 5 in a bundle, their sheaths usually 

 persistent; anthers mostly terminating in a semi-orbicular or al- 

 most orbicular crest ; wood generally harder, heavier, and more 

 resinous. 



A. Ducts peripheral. 



a. Cones subterminal. 



§ 3. Integrifoli.'E. Leaves smooth-edged, their sheaths deciduous ; 

 anthers terminating in a knob or a few teeth.— Western North 

 America and Mexico. 



* Cones short subglobose, with thick scales, unarmed : seeds large 

 with a minute wing; leaves i to 5. Ceinbroides. 



P. Parryana, cembroidcs, edulis, monophylla.^ 



* * Cones oval or elongated, scales armed with a deciduous or 



persistent prickle or an awn, seeds much shorter than the wing, 

 leaves in fives. Balfouriana. 

 P. Balfouriana.,'' {arisiata). 



§ 4. Sylvestres. Leaves serrulate, their sheaths persistent; anthers 

 crested or (only in P. sylvestris^ merely knobbed. — Europe and Asia, 

 one species in America. 



* Leaves in threes; wings much longer than seeds. — East India 

 and its islands, hidicce. 



P. K/iasia,~ i/isularis.'^ longijolia.'' 



** Leaves in twos; strengthening cells abundant, principally 

 around ducts; fructification biennial, cones and seeds small, 

 wings large. Ensylvestres. — Old World, one species in North- 

 eastern America. 

 P. sylvestris,^ mo?itana,^ resinosa," densiflora.'^^ Alassoniaria,^'^ ? Mer- 

 kusit. ^ " 



*** Leaves in twos; strengthening cells under the epidermis 

 and around ducts; fructification triennial, cones and seeds 

 large, wings rudimentary. — A single Mediterranean species. 

 P. Pine.a. 



b. Cones lateral. 



§ 5. Halepenses. — Old World. 



* Leaves in threes, their sheaths deciduous ; umbo very promi- 

 nent; wings shorter than the large seeds. GerardiatiiE. Asia. 



P. Gerardiana,^^ Bu7igeana. 



** Leaves in twos, their sheaths persistent; cones smoothish; 

 wings much longer than the seeds. Bu/iaiepenses.—Mediter- 

 ranean regions. 



