160 



PTELEA— PYCNANTHEMUM. 



psuchos, cool, otruno, to excite, alluding to 



its properties.] 



lanceold'ta, ( 'F) .) branches and leaves 

 reddish, hairy beneath; leaves lanceolate, 

 acuminate at both ends; stipules clasping, 

 rouudi.sh, caducous; corymb terminal, '-i- 

 /orked at the base. Florida. 

 PTE'LEA. 4—1. (TerebintacecB.) iFrom pielea, 



elm, the fruit of tlxis genus resembling that 



of the elm.] 



tnfolia'ta, (q-w. J. '^ .) leaves trifoliate; 

 flowers panicicd, dia'cious. Var. penta- 

 phyl'la, leaves quinate. Yar. pubes"ce7is, 

 leaves pubescent. 6-8 f. 



baldicin"ii, leaves very small, glabrous ; 

 leafets sessile, oval, obtuse, the terminal 

 ones cuneiform at the ba.se ; fiow^ers tetan- 

 drous ; styles none. Florida. 



monophyVla, leaves simple, lanceolate- 

 ovate, nearly sessile ; flowers racemed ; 

 fruit 3-winged. S. 

 PTE'RIS. 21 — 1. (FiHces.) [From pteron, d^ 



wing, so called from the likeness of its 



leaves to wings.] 



cu/uili'na, (common brake, Ju. 2j!.) frond 

 pinnate, 3-parted ; barren branches doubly 

 pinnate, with leafets lance-linear, obtuse 

 pinnatifid, toothed ; fertile branches pin- 

 nate, with leafets pinnatifid ; divi.sion3 acu- 

 tish, all ciliate. 



atropurpu'rea, (rock brake, Ju. 2X.)fi'ond 

 pinnate ; lower leafets lanceolate, obtuse, 

 ternate or pinnate ; at the base obtusely 

 truncate or sub-cordate. Var. veno'sa,\eii{- 

 ets veined beneath ; stipe angled. Var. 

 vuncta'ta, leafets punctate beneath ; stipe 

 lerete, dark purple. 3-10 i. 



cauda'ta, (Au. 2^.) frond 3-parted, pin- 

 nate ; barren divisions bi-pinnate ; leafets 

 linear, elongated, obtuse, entire ; lower 

 ones bi-pinnatifid ; fertile branches pinnate ; 

 leafets remotish below ; at the base pin- 

 natiiid, dentate. 



peda'ta, (Ju. 11) frond deeply 5-lobed- 

 palmate ; lobes pinnatifid ; segments lance- 

 linear, acute. 6 i. S. 

 PTEROCAU'LON. 17—2. {Corymbiferw.) [From 



pteron, a wing, and kaulos, a stem.] 



pi/cnostach"ya, (black-root, w. Au. 2|.) 

 stem erect, simple, winged ; leaves lanceo- 

 late, slightly undulate, dentate, tomentose 

 ana white beneath ; spike cylindric ; flow- 

 er» clustered. S. 

 PTEROSPO'RA. 10—1. (Enca.) [From 



pleron, a wing, spora, seed.] • 



aiidrom"eda, (Albany beech-drops, r-y. 

 Ju. ^.) scape purple, very tall, bearing a 

 many-flowered raceme ; flowers lateral 

 and terminal, nodding ; peduncles filiform, 

 longer than the flowers ; lanceolate scales 

 below, none above. 1-2 f. 

 ^ULMONA'RIA. 5—1. (Boraginece.) [From 



pulmo, the lung, so called on account of its 



efTicacy in diseases of the lungs.] 

 virgin"ica, (b. M. J. 2Lf.) smooth; stem 

 erect ; radical leaves obovate, oblong, ob- 

 •use leaves of the stem narrov/er; flowers 

 n terminal raceme.":: or fascicles ; calyx 

 much shorter than the tube of the corolla ; 

 gegments lanceolate, acute ; leaves some- 

 f^'hat glaucous ; flowers large, bright blue. 

 i*lant becDmee black by dryinc;. 



officina'lis, (spotted lung-wort, b. M. If.l 

 leaves ovate, hairy, generally epecklea 

 with white on the upper side ; the lower 

 leaves on long petioles, the upper ones ses- 

 sile ; flowers violet-blue. 12 i. Ex. 



alpi'ua, (b. 2^.) nearly glabrous; titem 

 simple, assurgent ; leaves spatulateovate ; 

 flowers in terminal fascicles, 6ub-se.ssile ; 

 segments of the calyx oblong, obtusish, 

 ciliate, about half the length of the corolla. 

 6 i. 



lanceola'ta, (b. w. li) glabrous, erect, 

 radical leaves very long-petioled, lanceo- 

 late ; cauline ones linear-oblong ; flowers 

 sub-panicled ; calyx short. S. 



cilia' ta, (b.) glabrous ; leaves lance-ovate 

 attenuate at each end, ciliate on the mar- 

 gin ; flowers fascicle-panicled, pedicelled; 

 corolla tubular-bell-form; calyx short, 5. 

 parted ; segments ovate, obtu.se. 1 f. S. 

 PU'NICA. 11 — 1. (Rosaceae.) {Froxn punicus, 



Cartiiaginian.] 



grana'tum, (pomegranate, Fp .) leaves lan- 

 ceolate ; stem w^oody. Ex. 

 PURSH"1A. 11—1. (Rosacea.) [In honor 



of Frederic Pursh, author of the North Amer- 

 ican Flora.] 



tridenta'ta, ( ^ .) branches erect ; branch- 

 lets numerou.s, short; leaves in fascicles, 

 simple, 3toothed, white beneath ; flowers 

 terminal or solitary. A North American 

 shrub, with small yellow flowers, quite 

 hardy. 

 PYCNAN"THEMUM. 13—1. (Labiatce.) [From 



puknos, dense, anthos, flower, on account ol 



its crowded inflorescence.] 



A. Stamens exsert. 



in"cannm, (wild basil, mountain-mint, w. 

 r. Ju. ZJ!.) leaves oblong-ovate, acute, sub- 

 serrate, white-downy ; flowers in compound 

 heads, lateral ones peduncled ; bracts se- 

 taceous. 1-5 f. 



arista' turn, (w. Au. 11) leaves lance- 

 ovate, sub-serrate, on very short petioles, 

 whitish ; heads sessile ; bracts awned ; 

 flowers very small, in one or two sessile 

 whorls and a terminal head ; bracts and 

 calyx terminated by long awns. 



linifo'lium, (Virginian thyme, w. Ju. 2^.) 

 stem straight, much branched, somewhat 

 scabrous; leaves linear, 3-nerved, very en- 

 tire, smooth ; heads terminal, in a fascicu- 

 late corymb; stem 12-18 inches high, with 

 trichotomous, fastigiate branches; flowers 

 minute, shorter within. "Woods. 



virgin"icum, (narrow-leaf Virginian 

 thyme, w. J. Z/) Pubescent ; leaves ses- 

 sile, lance-linear, entire, punctate , heads 

 terminal, corymbed ; bracts acuminate. 12- 

 18 i. Mich. 



B. Stamens included. 



verticilla'tum, (w. Au. 11) leaves lance- 

 ovate, sometimes toothed ; whorls sessile, 

 compact ; bracts acuminate. 2 f. Moun- 

 tains. 



lanceola' titm, leaves linear-lanceolate, en- 

 tire, veined; heads terminally sessile, in 

 fascicled corymbs. 



mu'ticum, (w. Ju. 24-) ^eavea lance-ovate, 

 sub-dontate ribbed, Bub-glabroas ; heads 



