281 



CLV. PISTIACE^. 



1. LEMNA, Linn. 



1. L Trisulca, Linn. sp. 1376. — Fronds joined crosswise, 

 stipitate, oblong-lanceolate, denticulate near the apex, thin, sub- 

 mersed, flower-bearing, swimming ; rootlets solitary. In stand- 

 ing water. Syn. Lenticula trisulca; Scop. Carn. No. 1 143 ; Stamo- 

 geton, Reich. Consp. 44 ; L ciuciata, l^oxb. Fl. Ind. iii, 666. 



2. L Globosa, Roxh. FL Ind. iii^ 565. — Single, globular, root- 

 less, minute, one or two together, each about the size of a grain of 

 sand. Forms a green scum on the surface of stagnant water. 



2. PISTIA. 



1 . P Stratiotes, Linn. Zeyl. 322. — An aquatic plant ; leaves 

 subrotund, obcordate, rosulate, waved on the margins ; the nerves 

 spreading like a fan, uniting into a truncate arc at the base ; 

 spadices axillary, solitary, seated on a short scape. Rumph. Amb. 

 vi, t. 74, fig. 2; Rheed. Mai. xi, t. 32; Roxb. Cor. t. 268; Jacq. 

 Amer. Stirp. t. 148. Common in tanks. 



CLVI. CYPERACE^. 

 1. CYPERUS, Linn. 



1. Squarrosus, Linn. Am. Acad, iv, 303. — Leaves linear- 

 keeled, glabrous, longer than the culm ; umbel with 3 to 5 rays ; 

 rays very unequal, with many spikes; spikes clustered, 10 to 11- 

 flowered ; involucre very long ; scales sharply keeled, 3-nerved, 

 mucronate ; flowers monandrous ; achenium linear triangular, one- 

 third shorter than the scale. Syn. C madraspatanus, Willd. sp. i, 

 278 ; Pycreus squarrosus, N. ab E. in Linn, ix, 283 (?) ; C squar- 

 rosus, Roxb. Fl. Ind. i, 194. Cum pygmaeo conjungit, a pigmy 

 plant, in the bottoms of dried water-holes, half an inch high. 



2. PoLYSTACHYUS, Rottb. Gram. 39, t. 11, f. 1. — Culm trian- 

 gular, glabrous, leafy at the base ; leaves shorter than the culm, 

 flat and keeled, generally rough on the margins ; umbel, with 

 several rays, for the most part contracted ; rays branched, corymbi- 

 form at the apex, many-spiked, most frequently abbreviated ; invo- 

 lucre 3 to 6-leaved ; spikes fascicled corymbiform, linear- lanceolate 

 compressed, 20 to 22-flowered ; scales ovate-elliptic, keeled, shortly 

 mucronated ; keel 3-nerved and green ; stamens 2. Syn. C. 

 fascicularis, Lam. Ulustr. i, 144, t.3S, /. 2; Pycreus polystachyus 

 and Tetraphyllus, Beau v. ; C paniculatus, Rottb. Gram. 40. Grows 

 all over the world. Roxb. Fl, Ind. i, 193. 



36 e 



