514 ORDEE CXVII. CONIFERS. 



5. C. aquat'ica, (Mich.) A middle-sized tree. Leaves pinnate; leaf- 

 lets narrow, lanceolate, oblique, slightly serrate, glabrous, 9 — 13, with 

 the midrib tomentose. Fruit nearly round, angled. — ^. April. In 

 swamps. 40 — 60 feet. 



GyMITOSPEE'M-^. 



Ovules naked and fertilized by the direct action of the pollen. 

 Cotyledons often numerous. 



Order CXVIL— CONIF'ER^. {Cone -hear iny Family) 



Flowers monoecious or dioecious ; sterile flowers raonandrous 

 or 5, and monadelphous, collected in a catkin. Anthers 2 or 

 many lobed, bursting outwardly ; fertile flowers usually in 

 strobiles or cones, sometimes solitary. Ovary none or open, 

 resembling a scale, destitute of style or stigma. Ovules naked. 

 Fruit a naked seed. Leaves with parallel veins. Trees or 

 shrubs, abounding in resin. 



Genus I.— PI'NUS. L. 19—15. 

 (From pinos, the Greek for Pine-tree.) 



Flowers monoecious. Sterile flowers ; scales peltate. Peri- 

 anth none. Anthers 2, each 1-celled, sessile. Fertile flowers 

 in an ovate cone. Scales closely imbricate, 2-flowered. Pistil 

 1. Nut winged. Scales woody. 



a. Leaves 2 — 5, with a sheath at the base. Scales of the cone thickened at 

 the summit. 



1. P. in'ops, (Ait.) A small tree, abounding in resin, with scattered, 

 smooth branches. Leaves short, in pairs. Cone oblong, conic, about 

 the length of the leaves. Scales with subulate spiues. — ^ . May. 

 Sandy barrens. 20 — 40 feet. Scrub Pine. 



2. P. vaeiab'ilis, (L.) a large tree, much branched. Leaves by 

 pairs or threes, slender and channeled, 4 — 5 inches long, deep green. 

 Cone generally solitary, ovate, 2 — 3 inches long. Scales with incurved 

 spines. — "^ . April. Along the sea-coast. 60 — TO feet. 



3. P. rig'ida, (L.) a large tree. Leaves by threes, 4 — 6 inches 

 long, with short sheaths. Cones ovate, scattei-ed, or in clusters, usu 

 ally the latter, 2 — 4 inches long. Scales with reflexed spines. — ^ 

 April — May. Usually in the upper country. 70 — 100 feet. 



4. P. seeoti'na, (Mich.) A small tree. Leaves by threes, 6 — 8 inches 

 long. Cones ovate, large for the size of the tree. Scales with straight, 

 Blender spines. — ^. April. Around ponds. 30— 40 feet. 



