PHRAGMITES-PINUS. 125 



ciliate; corymbs 5-flo\vered; pedicels 3-cleft; divisionjj of the corolla 

 wedge-form, emarginate ; teeth of the calyx subulate, scarcely shorter than 

 the tube of the corolla. Cultivated. 3-6 i. 

 pyrami'dalis,{p. Au. %..) erect, smooth ; stem scabrous ; leaves cordate-acute; 

 panicle fastigiate, pyramidal ; segments of the corolla wedge-form, trun- 

 cate ; leaves opposite, sessile, very entire. Mountain meadows. 2-3 f. 



PHRAGMITES. 3—2. {Gramineob.) 

 commu'nis, (Au. %.) calyi about 5-flowered ; florets longer than the calyx, 

 6-12 f. 

 PHRYMA. 13—2. (Labiatm.) 

 leptosta'chia, (p. w. %..) leaves large, ovate, toothed, petioled ; spikes terminal, 

 slender ; flowers opposite, small. Shady woods. 2-3 f. 



PHYLLANTHUS. 19—5. (Euphorbia.) [From 7)A?^Wore, a leaf, and aniAos, flower, because 

 the flowers in one of the original species, (since placed in another genus,) grow out of the 

 leaves.] 



obova'tus, (S. ©.) leaves alternate, oval-obtuse, glabrous ; flowers few, axil- 

 lary, pedicelled, nodding; stem erect; branches distichus. 



PHYSALIS. 5 — 1. (SolanecB.) [From pAt^ao, to inflate, so called because its seed is contain- 

 ed in a kind of bladder.] 



visco'sa, (yellow henbane, y. Ju. %.) leaves in pairs, heart-oval, repand, ob- 

 tuse, siib-tomentose, a little viscous ; stem herbaceous, paniculate above ; 

 fruit-bearing calyx pubescent. 2-3 f. Road-sides. 



obscu'ra, (y. p. Au.) pubescent; stem prostrate, divaricate; leaves broad-cor- 

 date, sub-solitary, toothed ; flower solitary, nodding; calyx hairy ; flowers 

 pale yellow, with 5 purple spots at the base; anthers bluish. Hills. 



pennsylva'nica, (y. S. %) stem branched; leaves ovate, obtuse; peduncles 

 axillary, solitary, a little longer than the petioles. 1 f. Road-sides. 



alkeken"gi, (winter-cherry,) leaves in pairs, entire, acute, sub-ramose below. 

 Ex. 



PHYTOLACCA. 10—10. (Atriplices.) [From pAu/ora, a plant, and ZfflAAa, gum-lac, on account 

 of the colour of its fruit.] 

 decan"dra, (poke- weed, w, Ju. %..) leaves ovate, acute at both ends ; flowers 

 racemed ; berries flattened at the ends. 3-6 f. 



PINGUICULA. 2—1. {Scrophularia.) [From pw^MJs, fat, so called because its leaves are 

 greasy to the touch. ] 

 vulga'ris, (butter-wort, M. %.) spur cylindrical, acute, as long as the veinless 

 petal ; upper lip 2-lobed, lower one in 3, obtuse segments ; leaves radical, 

 spatulate, ovate, fleshy ; flowers solitary, nodding ; tube of the corolla vil- 

 lose, purple. Wet rocks. Rochester, N. Y. and N. to Canada. 

 lute'a, border of the corolla 5-cleft ; spur subulate, a little shorter than the 

 tube. 6-8 i. Flowers yellow. S. 

 pmus. 19-16. 



A. Leaves solitary, with separate bases. 

 ca7iaden"sis, (hemlock-tree, M. li.) leaves flat, denticulate, 2-ranked; strobiles 

 ovate, terminal, scarcely longer than the leaves. The bark is used in tan- 

 ning leather. 

 balsa'mea, (American silver-fir, balsam-fir, M. T7.) leaves solitary, flat, glau- 

 cous beneath, somewhat pectinate at the summit ; strobile cylindrical, erect. 

 40-50 f. 



B. Leaves many, sheathed at the base. [^Leaves in pairs.'] 

 resino'sa, (yellow-pine, Norway-pine, red-pine, M. T^) leaves and sheath elon- 

 gated ; strobiles ovate-conic, rounded at the base, sub-solitary, about half 

 as long as the leaves ; scales dilated in the middle, unarmed. Bark of a 

 reddish colour, and much smoother than the pitch-pine, or white-pine. 

 Often grows very tall and straight. 



[Leaves in threes^ 

 rig"ida, (pitch-pine, M. T^-) leaves with abbreviated sheaths; staminate 

 aments erect-incumbent; strobiles ovate, scattered or aggregated; spines 

 of the scale reflexed. Though very common, it grows most plentifully oa 

 barren, sandy plains. 



