126 
PIPER—POLYGALA. 
C. Leaves many , in a fascicle. 
pcn"dula , (black larch, tamarack, hackmatack, M. I 2 .) leaves deciduous; 
strobiles oblong; margins of the scale indexed; bract guitar-form, with a 
slender point. 
PIPER. 2—3. ( Urticecc .) [Originally pippul, in the Bengalese tongue.] 
leptostaJ ckyon, (Florida pepper, <§).) herbaceous, small, leaves obovate, obtuse, 
sub-3-nerved, pubescent; spikes axillary, filiform, erect, much longer than 
the leaves. 6-12 i. S. 
PISTIA. 15—8. ( Gerania .) 
spathula'ta , (vv. Ju.) leaves abruptly narrowed into the petiole, dilated, round 
and obtuse towards the summit. <S. 
PISUM. 16—10. ( Leguminoscb .) 
sati'vum , (pea, p. w. J. <v).) petioles terete; stipules round and crenate at the 
base; peduncles many-flowered. Var. umbcllalum , (boquet pea.) has the 
stipules 4-cleft, acute. Var. quadratum , (quadrate pea.) fruit ash-colour, 4- 
sided. Var. humile , (dwarf pea,) stem erect, not climbing; leafets round¬ 
ish. Ex. 
PLANERA. 5—2. ( Amentacece .) / , 
aquati'ca , (M. Iq.) leaves ovate, acute, serrate, equal at the base, slightly 
scabrous, short-petioled. 25-30 f. S. 
PLANTAGO. 4—1. ('Plantaginea.) [Yxom planta, the sole of the foot, so called because its 
leaves are trodden under foot.] 
ma'jor , (plantain, w. J. 2 ]..) leaves ovate, sub-dentate, sub-glabrous; scape 
terete ; spike oblong, imbricate. 6-24 i. 
PLAT ANUS. 19—13. (Ament ace a.) [Yxomplata, broad, alluding to the size of the tree.] 
occidenta'lis , (buttonwood, American plane-tree, false sycamore, J. Tq.) leaves 
5 -angular, obsoletely lobed, toothed, pubescent beneath ; stem and branches 
becoming white. One of the largest trees in N. America. 
POA. 3—2. (Grarninecb .) [From a Greek word signifying grass.] 
annua , (Ap. <?).) panicle sub-secund, divaricate; spikelets ovate-oblong, 5- 
floweredflorets free ; culm oblique, compressed; root fibrous. 6-8 i. 
pratensis , (J. if.) panicle diffuse; upper leaves much shorter than the smooth 
sheaths; florets acute, 5 -nerved, webbed at the base; stipule short-truncate, 
root creeping. 2-3 f. 
PODOPHYLLUM. 12—1 ( Rahunculacece .) [From pous, foot, and phulion, leaf, on account 
of the shape of its leaf.] 
peltatum, (wild mandrake, may-apple, w. M. if.) stem terminated with 2 pel¬ 
tate, palmate leaves; flower single, inserted in the fork formed by the peti¬ 
oles of the leaves. Sometimes the plant is 3-leaved, and the flower inserted 
on the side of one of the petioles. 1-2 f. 
POGONIA. 18—1. ( Orchidece .) [From a Greek word signifying beard.] 
ophioglosso'ides , (snake-mouth arethusa, r. Ju. 2J-.) root fibrous; scape with 2 
distant leaves, 1 - 2 -flowered ; leaves lance-oval; lip fringed. 8-12 i. 
veriidllaia , (y-r. J. if.) leaves 5-veriiciilate ; flower solitary ; 3 outer segments 
of the perianth long^and linear; the inner ones lanceolate, obtuse; lip 3- 
lobed, dilated, the middle lobe undulated ; root fasciculate. Swamps. 
POLEMONIUM. 5—1. ( Polemonia .) [An ancient name derived from polemos, war, because, 
according to Pliny, kings contended for the honour of its discovery.] 
rep"tans, (Greek valerian, b. M. if.) leaves pinnate, leafets 5-13; flowers 
terminal, nodding. 
POLYANTHES. 6 —1. (Narcissi.) [From^ot^s, many, and anthos, flower, because it bears 
many flowers.] 
tubero'sa, (tuberose, if.) flowers alternate, in pairs, rootlets tuberous; scape 
scaly; leaves linear, long; sweet-scented. Ex. The polyanthus of the 
gardens belongs to the genus Primula. 
POLY’GALA. 16—6. (Leguminosce.) [From polus, much, and gala, milk, from its milky juice.] 
paucifo'lia, (flowering wintergreen, r. M. if.) small, large-flowered; stem 
simple; erect, naked below; leaves ovate, acute, glabrous, near the top of 
the stem; flowers crested, terminal, about in threes. 3-4 i. 
