^ PINACEAE. 



Cone-scales thin-edged, the appendages flattish, the spines hooked. 



1. P. pahistris. 

 Cone-scales thick-edged, the appendages turgid, the spines 



slightly recurved. 2. P. carihaca. 



Cones short, of an ovoid type and less than twice as long as 

 thick when closed, prominently umbonate, the scale-ap- 

 pendages elevated, often pyramidal, with nearly straight or 

 decurved spines. 3. p. EUiottii. 



Resin-ducts of the leaf remote from the fibro-vascular bundle. 



Cones over 9 cm. long, of an elongate type when open ; scales 



with stout spines. 4. p. Taeda. 



Cones less than 9 cm. long, of a short type when open ; scales 

 with slender minute or obsolete spines. 

 Cones ovoid or globular-ovoid when closed : leaves 15-25 cm. 



long, about 2 mm. wide. 5. P. serotina. 



Cones narrowly conic when closed : leaves 4-12 cm. long, 

 about 1 mm. wide. 

 Cone-scales readily opening, each with a slender or 

 minute spine towards the front of the appendage, 

 the spine sometimes deciduous or obsolete. 

 Cones mainly less than 5 cm. long : scales of the 

 staminate aments erose-toothed at the apex : bark 

 of the trunk relatively close and smooth. 6. P. glabra. 



Cones mainly over 5 cm. long : scales of the staminate 

 aments entire : bark of the trunk very rough and 

 shaggy. 7. P. echinata. 



Cone-scales tardily opening or permanently closed, each 

 with a firm spine at the middle or towards the back 

 of the appendage. 8. P. clausa. 



1. P. palustris Mill. Tree becoming 40 m. tall, irregularly branched above, the 

 bark in large plates: leaves typically in 3 's, 20^0 cm. long, bright-green, borne 

 in terminal plumes: staminate aments 5.5-8 cm. long: cones 16-25 cm, long, 

 narrowly conic when closed, broadly conic when open, each scale-appendage with 

 a recurved spine: seeds 12-13 mm. long, the wing 4.5-5 cm. long 



The LONG-LE.AF PINE forms open forests in sandy soil, usually In dry places, in 

 Florida, except the lower part of the peninsula. The light-red or orange heart-wood 

 is coarse-grained, heavy, hard, strong, and durable. Also known as Yellow-pine. 

 Southern-pine. Georgia-pine. Pitch-pine. (Cont.) 



2. P. caribaea Morelet. A tree usually smaller than P. palustris: leaves in 

 2's or 3's, 18-30 cm. long or shorter, bright-green: staminate aments 2.5-4 em. 

 long: half mature ovulate aments ascending: cones 8-15 cm. long, cylindric- 

 conie when closed, cylindric or ovoid-cylindric when open: each scale-appendage 

 turgid: seeds 4-7 mm. long, the wing 2-2.5 cm. long, or smaller. 



The Sl.^sh-pine grows in dry sand close to most of the coast line of Florida, and 

 on rock on the Everglade Keys, the lower Florida Keys and a few of the upper keys. 

 The orange-colored heart-wood is coarse-grained, heavy, hard, and often quite durable. 

 Also known as Swamp-pine. 



3. P. Elliottii Engelm. A tree becoming 30 m. tall : leaves in 2 's or 3 's, deep- 

 green: staminate aments 3.5-5 cm. long: half mature ovulate aments recurved: 

 cones S-12 cm. long, narrowly ovoid when closed, broadly ovoid when open, 

 each scale-appendage very prominent: seeds 6-8 mm. long, the wing 2-3 cm. 

 long. 



The Swamp-pine grows in shallow ponds and swamps, and in low grounds 

 which are dry part of the year, in northern Florida and in the peninsula as far south 

 as the Everglade region. The yellowish-brown heart-wood is close-grained, heavy, 

 hard, and tough. Also known as Blue-pine. (Cont.) 



4. P. Taeda L. Tree becoming 46 m. tall, the dark bark deeply furrowed, very 

 rough, exfoliating in coarse plates: leaves in 3's, glaucous, 15-28 cm. long: 

 cones 10-13 cm. long, narrowly conic when closed, cylindric or conic-cylindric 

 when open, the scale-appendages thick, projecting little, if at all, beyond the 

 small spine: seeds 6-7 mm. long, the wing about 2 cm. long. 



The Old-field pine grows in usually dry sandy soil in Florida, except in the 

 southern half of the peninsula. The brown heart-wood is coarse-grained, brittle, and 

 not durable. Also knowTi as Loblolly-pine. (Cont.) 



5. P. serotina Michx. Tree becoming 25 m. tall, with many short irregular 

 branches near the base, the bark flaky: leaves in 3's, glaucous, 15-25 cm. long. 



