PLATYSPETALUM— P0D06TEMUM. 



143 



PLATYSPET"ALUM. 14—1. (Crucifrrcc.) 

 [From flatus, broad, petalon, leaf.] 

 purpuras" ceua, stigma '2-lobed, spread- 

 ing; style manifest ; scape naked, 1 leaved, 

 and pubescent ; silicles sub-glabrous. 



dii'bimn, stigma undivided, sub-sessile ; 

 eilicles and scapes pubescent. 



PLATYSPER"MUM. 14—1. (Crucifercc.) 

 [From platus, broad, sperma, seed.] 

 scapigc'rum, (vv. Mar. Ap. 0.) root sub- 

 fusiform, scarcely fibrous ; leaves all radi- 

 cal, spreading, sub-runcinatepinnatifid ; 

 lobes mostly acute ; lower ones gradually 

 smaller, attenuated into a petiole ; scapes 

 digitate, erect, simple, very glabrous, 1- 

 flowered ; ilow^ers small, erect. 



PLECTRI'TIS. 3—1. (Dipsace^.) [From plek- 

 iron, a spur, alluding to the form of the 

 corolla.] 



conges" ta, (r. 0.) glabrous ; flowers in a 

 dense whorl ; bracts many-cleft, in subulate 

 divisions. Var. mz'wor, leaves very narrow. 



PLEE'A. 9—2. (Junci.) [From a Greek 

 word signifying abundance, from the num- 

 ber of stamens.] 

 teunifo'lia, (y. r. 2J[.) veiy glabrous; 



•eaves very narrow-ensiform ; sheaths of 



the spike 1-flowered. 1-2 f. 



PO'A. 3—2. (Graminea:.) [From a Greek 



word, signifying grass.] 



annu'a, (Ap. ^.) panicle sub-secund, 

 divaricate ; spikelets ovate-oblong, 5-flow- 

 ered ; florets free ; culm oblique, compress- 

 ed ; root fibrous. 6-8 i. 



prateti"sis, (J. 2X-) panicle diffuse; up- 

 per leaves much shorter than the smooth 

 ^heaths ; florets acute, 5-ncrved, webbed at 

 Tlie base ; stipule short-truncate, root creep- 

 ing. 2-3 f. 



aquat"ica, var. america'na, (Au. 2_f .) pan- 

 icle erect, semi-verticillate, diffuse;branches 

 flexuous, smooth ; spikelets linear, 6-8-tlow- 

 ered ; florets ovate-obtu.se, free ; leaves 

 broad-linear, smooth ; sheaths smooth. 4-5 f. 



trkyla'Iis, (.Ju. 2^.) panicle equal, diffuse ; 

 spikelets oblong-ovate, about 3-flowered ; 

 florets webbed at the base, Snerved; culm 

 and sheaths roughish ; stipules oblong ; root 

 creeping. 2-3 f. 



cornprai"sa, (blue-gras-s, Ju. 2^.) panicle 

 contracted, .'somewhat secund ; spikelets 

 oblong. 3-6-flowered ; florets webbed ; 

 glumes nearly equal ; culm oblique, com- 

 pressed ; root creeping, Var. ftj/lves"l7-is, 

 panicle loose, spreading ; spikelets 2-3 flow- 

 ered; culm slender, nearly erect. 12-18 i. 



seroti'na, (J. 2|.) panicle elongated, dif- 

 fuse, at length somewliat secund ; spikelets 

 lance-ovate, 2-3-flowered ; florets a little 

 webbed at the ba.«e, yellow at the tip, ob- 

 scurely 5 nerved ; root creeping. 2 3 f 



nemo ra.' I IS, [24..) panicle attenuated, weak; 

 branches flexuous ; spikelets ovate, about 

 3-flowered ; florets loose, slightly webbed, 

 acute, obsoletely nerved ; stipule almost 

 wanting. 2 f. 



nervn'la, (J. 2^.) panicle equal, diffuse; 

 branches weak, at length pendulous; spike- 

 hUs 5-flowered ; florets tree, conspicuously 

 7-uervt;d, obtuse. 3 4 f. 



oblu'sa. (Au. ?4-) panick ovate, contract- 



ed ; spikelets ovate, tumid, 5-7-flowered , 

 florets free ; glumes scarious ; palea ovate, 

 smooth, obtuse ; lower one indistinctly 7- 

 nerved ; leaves as long as the culm, with 

 the sheaths smooth. 2-4 f. 



canatle7i"sis, (Ju. 14..) panicle large, ef- 

 fuse ; branches semi-verticillate, flexuous, 

 at length pendulous ; spikelets ovate, tu- 

 mid, 5-8-flowered ; florets free ; lower pa- 

 lea acutish, 7-nerved ; upper one very ob- 

 tuse ; stamens 2. 3-4 f. 



capilla'ris, (Au. 0.) panicle very large, 

 loose spreading, capiflary ; spikelets 3-flow- 

 ered, ovate, acute ; florets free ; culm 

 branched at the ba.se ; leaves hairy. 12 i. 



pcctina'cea, (Ju. %) culm cespitose, ob- 

 lique ; leaves hairy at the base ; panicle 

 capillary, expanding, pyramidal, hairy in 

 the axils ; spikelets linear, 5-9-flowered ; 

 florets free, acute, upper palea persistent 

 8-12 i. 



rep/' tans, (Au. 0.) dioecious; culm 

 branched, creeping ; panicle fascicled ; 

 spikelets lance-linear, 12-20-flowered ; flo- 

 rets acuminate. Var. ca;spito'sa, culm very 

 short, cespitose ; spikelets much crowded, 

 oblong. 8 i. 



eragros"tis, (Ju. 0.) panicle equal, spread 

 ing; lower branches hairy in the axils 

 spikelets linear-lanceolate, 9-15-flowered 

 florets obtuse ; root fibrous. 12-18 i. 



ten"uis, (Au.) panicle branching, expand 

 ing, capillary; spikes 3-flowered, glabrous 

 long peduncled ; leaves linear, very long. 

 12-18 i. S. 



parvijlo'ra, (J. 2^.) panicle diffuse, capil- 

 lary ; spikelets small, generally 3-flowured ; 

 flowers obtusish, striate, caducous ; leaves 

 distichous, flat. 1218 1. S. 



confer" ta, panicles terminal and axillary, 

 erect, compres.sed, with clustered flowers; 

 spikelets 8-flowered, glabrous. 2-3 f iS. 



angusiifo' lia, (M. ZX-) leaves linear, invo- 

 lute ; panicle somewhat crowded ; spikes 

 lanceolate, acute, 4-flowered ; flowei's vil- 

 lose at the base. 1-2 f. /Sf. 



lii'tidn, (Ju.) stem erect, very glabrous; 

 panicle large, diftuse, capillary, sub-verti- 

 cillate ; peduncles long ; spikes lanceolate, 

 8-flowered. 1 f. S. 



rigi'da, (M. 2^.) panicle lanceolate, a 

 little branched, secund ; branches alternate, 

 secund. 2 4 i. S. 



airui'dca, panicle attenuated, erect 

 branches capillary, loo.se, semi-verticillate ; 

 leaves with very long sheaths, short and 

 acute ; spikelets oblong, obtuse, sub-ses.sile, 

 4 G-flowered ; glumes unequal, shorter ihau 

 the palea. 4-5 f tS. 



PODOPIIYL"LUM. 12—1. {Rnnuncvlacc,-., 



[Fiom pous, fotft, and phuJion, leaf, on ac 



count of the shape of Us leaf ] 



pelta'lum, (wild mandrake, may-apple 

 w. M. 2^.) stem terminated with 2 peltate, 

 palmate leaves ; flower single, in.scrted in 

 the fork formed by the petioles of the leaves. 

 Sometimes the plant is 8-leaved, and the 

 flower inserted on tne side of one of the 

 petioles. 1-2 f 

 PODOS"TEMUM. 10—3. {Aroidea.) 



ocratophyL'lu.m, (thread-foot, J a. li.) stem 



