136 



PANICUM— PARNA8SI.A. 



PAN"ICUIVf. 3-<2. (GraminecE.) 



crns-gal"U, (barn-grass, Au. ^.) racemes 

 alternate rnd in pairs; compound rachis 

 5-angled ; glumes terminating in hispid 

 bristles; sheath glabrous. 2-4 f. 



his"pidum, (S. Oc. 0.) panicle com- 

 pound; nodding racemes alternate; glumes 

 terminating in hispid bristles ; sheaths his- 

 pid. Salt marshes. 3-4 f. 



cla?tdesti'niim, (Au. 2/.) culm with short 

 axillary branches ; leaves broad-lanceolate, 

 cordate at base ; sheaths hispid, enclosing 

 the short panicle ; abortive floret neutral, 

 2-valved, upper valve obtuse. Moist woods. 

 2-3 f. 



latifo'laitn, (Ju. It) culm mostly simple, 

 bearded at the joints ; leaves oblong-lance- 

 olate, smooth, or with the sheaths somewhat 

 pubescent; panicle terminal, a little ex- 

 sert, simple, pubescent ; spikelets oblong- 

 ovate ; abortive floret antheriferous, 2 val- 

 ved. 1 f. 



puhes"cens, (J. 2/.) erect, much branched, 

 leafy, softly pubescent ; leaves lanceolate, 

 ciliate ; panicle small, few-flowered, free ; 

 spikelets sub-globose, ovate, pubescent. 

 18 1. 



dicliofomum, (Au. 2X-] culm much 

 branched, dichotomous above ; branches 

 fasciculate; leaves numerous, lanceolate, 

 smooth ; panicle simple, capillary, lax ; 

 abortive floret neutral ; upper valve mi- 

 nute, bifid. Var. curva'tum,cvL\m. very tall ; 

 branches few, somewhat curved. Var. 

 faacicula'tuvi, culm low, erect, or decum- 

 bent; branches and leaves dense-fascicled ; 

 panicles small, concealed among the leaves. 

 Var. gra'cili, culm tall, slender; leaves 

 membranaceous. 8-16 i. 



ni'tidum, (panic grass, Ju. 11) culm slen- 

 der, simple, smooth; sheaths bearded at 

 the throat; leaves few, broad-linear; pan- 

 icle capillary, rather crowded, compound, 

 remote, smooth ; spikelets minute, obtuse, 

 ovate, slightly pubescent ; lower glume 

 very small. Var. cilia' turn, culm hairy; 

 leaves linear-lanceolate (lower ones broad- 

 er), sparingly hirsute, ciliate on the mar- 

 gin ; panicle with the branches and flowers 

 pubescent. Var. raviulo' sum, culm more 

 branched ; panicle contracted ; branches 

 smooth. Var. pilo'sum, culm very hairy ; 

 lower leaves approximate and broad-lance- 

 olate, upper ones linear, rather rigid, sub- 

 pilose above, ciliate at base ; sheaths vil- 

 'ose, minutely papillose ; panicle sub-con- 

 tracted ; branches virgate ; flowers pubes- 

 cent. Var. gla'brum, smooth except the 

 base of the leaves, nearly simple ; lower 

 'eaves short, approximate, sub-cartilagi- 

 aous ; panicle branched, almost verticillate ; 

 apikelets large ; upper valve of the abortive 

 floret entire. Var. harba'tvm, culm simple, 

 smooth ; nodes hairy ; leaves linear-lanceo- 

 late ; sheaths smooth, except on the mar- 

 gin ; flowers minutely pubescent. 1-2 f. 



agrosf'oi'des, (An. 24- ■) culm compressed, 

 smooth, erect; leaves very long; panicles 

 lateral and terminal, pyramidal, spreading ; 

 branches bearing racemes; spikelets ap- 

 pressed; abortive floret neutral; valves 

 nearly equal. 2-3 f. 



virga'tum, (Au. 24!.) whole plant very 

 smootli ; panicle diffuse, very large ; flow- 

 ers acimiinate ; abortive floret nearly equal 

 3-4 f. ^ ^ 



ca-pillafre, (S. ^.) culm nearly simple ; 

 sheathsvery hairy; panicle large, capillar^^ 

 expanding, loose ; spikelets long-peduncle'd, 

 acuminate, smooth ; abortive floret 1-valved. 

 Var. sylva1f'icu,m,c\i\m branched at the base, 

 very slender ; leaves linear. 1-2 f. 



fus"co-r7i'bens, (Au.) racemes linear, vir- 

 gate ; glumes clavate, colored, hairy under 

 the divisions of the panicle. S. 



ama'nim, (Oc. 2^.) very glabrous ; leaves 

 thick, glaucous, very bitter ; panicle ap- 

 pressed ; glumes acuminate. 2-3 f. S. 



angustifo'linm, panicle few-flowered, ex- 

 panding; leaves scattered, linear-lanceo- 

 late, glabrous beneath, sparingly ciliate. 

 1-3 f. S. 



PAPA'VER. 12—1. {Papaverace<B.) [From 



pappa, pap, so called because nurses mixed 



this plant in children's food to make them 



sleep.] 



somnif'enim, (opium poppy, J. 0.) calyx 

 and capsule glabrous ; leaves clasping, 

 ga.shed, glaucous. Ex. 



rhe'as, (red corn-poppy, r. J. @.) cap- 

 sules glabrous, sub-globose ; stems many- 

 flowered, pilose; leaves gash-pinnatifid. 

 Ex. 



nudicau'Ie, (y. $ .) capsule hispid ; scape 

 1 -flowered, naked, hispid; leaves sub-pin- 

 nate; leafets lanceolate, lower ones some- 

 what gashed. 



bractea'ta, (r. J.) capsules smooth ; stem 

 1-flowered, rough; leaves scabrous, pinnate, 

 serrate ; flowers subtended by leafy bracts. 

 3f Ex. 



_ dn'bium, (r. w Au. 0.) leaves pseudo- 

 pinnate ; segments lance-oblong, pinnatifid, 

 incised, .sessile, decurrent; stem with spread- 

 ing hairs ; peduncles with appressed bristly 

 hairs ; capsules obovoid-oblong, smooth. 

 Naturalized in Chester co.. Pa. 1-2 f. 



PARIETA'RIA. 19—4. (Urticem.) [From a 



Latin word signifying wall, from its growing 



on old ruins.] 



penrisylva'nica, (pallitory J. @.) leaves 

 lance-oblong, veiny, opake, dotted ; involu- 

 crum 3-leaved, longer than the flower. 

 12-15 i. 



fiorida'na, (J.) leaves ovate, nearly round, 

 obtuse, opake, dotted ; flowers clustering 

 as long as the involucrum ; stem assurgent 

 12-18 i. S. 



PARME'LIA. 21—5. {Algm.) [Vxoxa ■parjne 

 shield, and et7o, to enclose.] 

 caper a' ta, (shield lichen,) frond orbicu 

 lar, pale yellow, becoming green, rugose, 

 at length granulated, dark and hispid be- 

 neath ; lobes plicate, sinuate-lachiiate, 

 roundish, somewhat entire; receptacles 

 scattered ; margin incurved, entire, at 

 length pulverulent. On old timber, &c. 



PARNAS"SIA. 5—4. (Saxifraga.) [From 

 Mount Parnassus, the seat of the Muses.] 

 amenca'na, (flowering plantain, \v. y. p 

 Ju. 2^.) leaves radical, (often a leaf on the 

 scape,) heart-orbicular, 5-9-nerved; necta- 

 ries 5, each divided into 3 filaments termi- 



