24 FAM. 10. 



*1. Cones over 7 cm. long, - ---_.._. „2 



1. Cones less long, -----------4 



2. Cones 16-25 cm.; leaves 3 in a sheath, 20-40 cm. long. In sandy 



soil, P. australis (palustrus), Long-leaved or Yellow Pine 



2. Cones 8-14 cm. long, -----___-_ 3 



3. Cones flat or depressed at the base; leaves 2-3 in a sheath, 18-30 



cm. long; resembles the preceding, but smaller. In low sandy 



soil, - - P. Elliotti, Swamp Pine, Blue Pine 



3. Cones rounded at the base; leaves 3, rarely 2-4, in a sheath, 15-28 



cm. long; glaucous; bark very thick and furrowed. In sandy, 



mostly damp soil, - - P. Taeda, Loblolly or Old Field Pine 



4. Cones ovoid, mostly opposite; leaves 3 in a sheath, 15-25 cm. 



long, glaucous; trunk with flaky bark and many short branches 

 near the base. Border of ponds and swamps, 



P. Serotina, Black or Pond Pine 



4. Cones narrowly conical when closed; leaves 4-12 cm. long, 5 



5. Cones readily opening, - ____-_»_6 



5. Cones 4.5-6 cm., tardily opening or remaining closed; leaves 2 in 



a sheath, 4-8 cm. long, very slender. On sandy ridges near 



the coast, ----- P. clausa, Sand Pine, Spruce Pine 



6. Cones mainly less than 5 cm. long; leaves 2 in a sheath, 4-8 cm. 



long, very slender; trunk with relatively smooth bark and 

 spreading branches near the ground. In the hammocks 



P. glabra, Spruce Pine, Cedar Pine, White Pine 

 6. Cones mainly over 5 cm. long; leaves 2-3 in a sheath, 8-12 cm. 

 long, slender; trunk with furrowed and very rough bark with- 

 out spreading branches near the ground. In sandy, rocky or 

 clayey soil, - P. echinata (mitis), Short-leaved Pine, Yellow Pine 



10. Juniperaceae, Juniper Family. 



Shrubs or trees with scale-like or subulate leaves ; flowers 

 without perianth; aments mostly solitary; cotyledons 2-9. 



1. Deciduous trees; leaves not scale-like; flowers monoecious; the sterile 

 aments in a drooping panicled spike, the fertile aments subglo- 

 bose, single or by pairs, sessile; cones globular, closed; seeds 

 angled, wingless, ____-- Taxodium, Cypress 



T. distichum, Bald Cypress. Very tall tree; bark relatively thin and smooth, 

 leaves 2-ranked, linear, spreading; knees conical. In swamps, but thrives 

 also in dry soil cultivated. 



F. imbricarium, Pond Cypress. Half as tall; bark thick and coarse, leaves ap- 

 pressed to the erect branchless; knees short and rounded. In lakes and 

 creeks, also in dry soil. 



1. Evergreen shrubs and trees, ---------2 



2. Flowers monoecious, sterile aments terminal, solitary, nearly sessile 



between the leaves; fertile aments solitary, terminal on short 

 branchlets, oblong; cones oblong, drooping; seeds flat, broadly 

 winged, ------- Thuja, Arbor Vitae 



Thuja occidentals and Thuja (Biota) orientalis, cultivated in varieties. 

 2. Flowers monoecious, sterile aments terminal, sessile or nearly so; 



*See Glossary for measurements. 



