136 
L. minor. Small Duclnoeed. Fig. 1351. 
Frond ovate, nearly flat. Root a single fibre. Ditches and ponds. 
Ann. June. E. B. 1. 1095. E.B. 2.34. II. Am. 477. Bab. 349. 
Lind. 251. 
L. gibba. Thick-leaved Duckweed. Fig. 1352. 
Frond obovate, hemispherical beneath. Root of several fibres. Ponds 
and ditches. Ann. June. E.B. 1. 1233. E.B. 2.35. Il.fyArn. 
477. Bab. 349. Lind. 252. 
L. polyrhiza. Great Duckweed. Fig. 1353. 
Frond roundish-ovate, furrowed. Root with numerous fibres. Ponds. 
Ann. June. E.B.\.24b$. E.B. 2.36. H.fyArn.477 . Bab. 349. 
Lind. 251. 
Order CIV. NAIADACEiE. 
Genus 1 Potamogeton. 
P. natans. Broad-leaved Bond-weed. Fig. 1354. 
Upper leaves oblong-ovate, stalked, floating; lower linear, sessile. 
Stipules large, free. Pools and streams. Perenn. July. Green, (f) 
E. BA. 1822. E.B. 2.236. H.fyArn. 484. Bab. 350. Lind. 250. 
P. plantagineus. Plantain-leaved Bond-weed. Fig. 1355. 
Leaves membranous, reticulated, stalked; upper ones elliptical; 
lower oblong. Spike slender. Pools. Perenn. July. Green, (§) 
E. B. Supp. 2848. H. fy Am. 484. Bab. 350. 
P. heterophyllous. Various-leaved Bond-weed. Fig. 1356. 
Upper leaves on footstalks, floating, elliptical; lower linear-lanceolate, 
sessile. Stipules small. Flower-stalks swelling upwards. Pools. 
Perenn, July. Green, (f) E.B. 1. 1285. E.B. 2.237. H.fyArn. 
482. Bab. 351. Lind. 250. 
P. rufescens. Bed Bond-weed. Fig. 1357. 
Upper leaves elliptic-lanceolate, on footstalks, floating; lower lanceo¬ 
late, nearly sessile. Stipules small. Plant reddish. Pools. Perenn. 
Aug. Brownish, (f). E. B. 1. 1286. E. B. 2. 238. H. fy Am. 
483. Bab. 351. Lind. 250. 
P. lucens. Shining Bond-vjeed. Fig. 1358. 
Leaves elliptic-lanceolate, submersed. Stipules large. Pools. Perenn. 
Aug. Green. (§) E. B. 1. 376. E. B. 2. 239. II. Am. 482. 
Bab. 352. Lind'. 250. 
P. lanceolatus. Lanceolate Bond-weed. Fig. 1359. 
Leaves lanceolate; upper ones sometimes floating. Spike ovate, 
dense, with few flowers. Stipules acute. Lakes. Perenn. Aug. Brown. 
(§) E.B. 1. 1985. E. B. 2. 240. H. 8f Am. 483. Bab. 351. Lind. 
250. 
P perfoliatus. Perfoliate Bond-weed. Fig. 1360. 
Leaves submersed, ovate, heart-shaped, stem-clasping. Stipules 
small. Ponds. Perenn. July and Aug. Brownish. (-§■) E.B. 1. 168. 
E. B. 2. 241. II. Am. 481. Bab. 352. Lind. 249. 
