126 PIPER-POLYGALA. 



C. Leaves many, in a fascicle. 

 pen"dula, (black larch, tamarack, hackmatack, M. h-) leaves deciduous; 

 strobiles oblong; margins of the scale inflexed; bract guitar-form, with a 

 slender point. 

 PIPER. 2—3. (UrticecB.) [Origmaily pippul, in Ihe Bengalese tongae.] 

 kptosia'chyon, (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. iGerania.) 



spathula'ta, (w. Ju.) leaves abruptly narrowed into the petiole, dilated, round 

 and obtuse towards the summit. S. 

 PISUM. 16—10. {Leguminosa.) 



sati'vum, (pea, p. w. J. ©.) petioles terete; stipules round and crenate at the 

 base; peduncles many-flowered. Var. uvibellalum, (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. (AmentaceiD.) 



aquati'ca, (M. Vj.) leaves ovate, acute, serrate, equal at the base, slightly 

 scabrous, short-petioled. 25-30 f. iS. 



PLANT AGO. 4—1. {Plantaginea.) [Yromplanta, the sole of the foot, so called because it3 

 leaves are trodden under foot.] 

 ma'jor, (plantain, w. J. %.) leaves ovate, sub-dentate, sub-glabrous; scape 

 terete ; spike oblong, imbricate. 6-24 i. 

 PLjVTANUS. 19 — 13. (AmenlacecB.') [Fromplata, broad, alluding to the size of the tree.] 

 occidcnta'lis, (buttonwood, American plane-tree, false sycamore, J. T^.) leaves 

 5-angular, obsoletely lobed, toothed, pubescent beneath; stem and branches 

 becoming white. One of the largest trees in N. America. 

 POA. 3—2. (.GraminecB.) [Fram a Greek word signifyini; grass.] 



annua, (Ap. ©.) panicle sub-secund, divaricate; spikelets ovate-oblong, 5- 



flowered; florets free ; culm oblique, compressed ; root fibrous. 6-8 i. 

 pratensis, (J. '2J-.) panicle diff"use ; 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 (Ranunculacem.) [From poMs, foot, and pAM^JOn, leaf, on account 

 of the shape of its leaf.] 

 peltatum, (wild mandrake, may-apple, w. M, Tj..) 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. (OrchidecB.) [From a Greek word signifying beard.] 

 ophioglosso'ides, (snake-mouth arethusa, r. Ju. %.) root fibrous; scape with 2 



distant leaves, 1-2-flowered ; leaves lance-oval ; lip fringed. 8-12 i. 

 verticillata, (y-r. J. %.) leaves 5-verticillate ; 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. 



POLEMONIUM. 5 — 1. (^Polemonia.) [An ancient name derived from po^emos, war, becausa 

 according to Pliny, kings contended for the honour of its discovery.] 



rep" tans, (Greek valerian, b. M. %..) leaves pinnate, leafets 5-13 ; flowers 

 terminal, nodding. 



POLYANTHES. 6—1. {Narcissi.) [Ftompolus, many, and anthos, flower, because it heart 

 many flowers.] 

 iMiero'sa, (tuberose, '2J-.) flowers alternate, in pairs, rootlets tuberous; scape 

 scaly; leaves linear, long; sweet-scented. Ex. The polyanthus of the 

 gardens belongs to the genus Primula. 

 POLYGALA. 16 — 6. (Leguminosm.) [FrompoZ?^, much, and ^ato, milk, from its milky juice.3 

 paucifo'lia, (flowering wintergreen, r. M. %) small, large-flowered ; stem 

 simple, erect, naked below ; leaves ovate, acute, glabrous, near the top Oi 

 the stem; flowers crested, terminal, about in threes. 3-4 i. 



