136 
L. minor. Small Duckweed. _ Fig. 1351, 
Frond ovate, nearly flat. Root a single fibre. nee and ponds. 
Ann. June. F. B.1. 1095. #. B. 2.34. HH. & Arn. 7. Bab. 349, 
Tind. 251. : L 4 
L. gipsa. Thick-leaved Duckweed. Fig. 1352. 
Frond obovate, hemispherical beneath. Root of several fibres. Ponds 
and ditches. Ann. June. FZ. B. 1.1233. #. B.2.35. H. & Arn. 
477. Bab. 349. Lind. 252. 
L. potyruiza. Great Duckweed. Fig. 1353, 
Frond roundish-ovate, furrowed. Root with numerous fibres. Ponds. 
Ann. June. 2£.B.1.2458. #. B. 2.36. H.& Arn. 477. Bab.349, 
Tand, 251. 
Orprer CIV. NAIADACEA:. 
Genus 1. PoTAMOGETON. 
P. natans. Broad-leaved Pond-weed. Fig. 1354. 
Upper leaves oblong-ovate, stalked, floating ; lower linear, sessile. 
Stipules large, free. Pools and streams. Perenn. July. Green. (4) 
EH. B.1.1822. #. B. 2.236. H.& Arn. 484. Bab.350. Lind, 250. 
P. PLANTAGINEUS. Plantain-leaved Pond-weed. Fig. 1355. 
Leaves membranous, reticulated, stalked; upper ones elliptical ; 
lower oblong. Spike slender. Pools. Perenn. July. Green. (2) 
Li. B. Supp. 2848. H.& Arn. 484. Bab. 350. 
P. HETEROPHYLLUS. Various-leaved Pond-weed. Fig. 1356. 
Upper leaves on footstalks, floating, elliptical ; lower linear-lanceolate, 
sessile. Stipules small. Flower-stalks swelling upwards. Pools. 
Perenn., July. Green. (2) #.B.1.1285. HE. B. 2.237. H. § Arn. 
482. Bab. 351. Lind, 250. 
P. rurescens. Red Pond-weed. Fig, 1357. 
Upper leaves elliptic-lanceolate, on footstalks, floating ; lower lunceo- 
late, nearly sessile. Stipules small. Plant reddish. Pools. Perenn. 
Aug. Brownish. (%). F. B.1.1286. 2. B. 2.238. H. § Arn. 
483. Bab. 351. Lind. 250. 
P. Lucens. Shining Pond-weed. Fig. 1358. 
Leaves elliptic-lanceolate, submersed. Stipules large. Pools. Perenn. 
Aug. Green, (3) H. B. 1.376. EH. B. 2.239. H. & Arn. 482. 
Bab. 352. Lind. 250. 
P. nancrouatus. Lanceolate Pond-weed. Fig. 1359. 
Leaves lanceolate; upper ones sometimes floating. Spike ovate, 
dense, with few flowers. Stipules acute, Lakes. Perenn. Aug. Brown. 
( H#. B.1.1985. EF. B. 2.240. H. & Arn. 483. Bab. 351. Lind. 
P. perrouiatus. Perfoliate Pond-weed. Fig. 1360. 
Leaves submersed, ovate, heart-shaped, stem-clasping. Stipules 
small. Ponds. Perenn. July and Aug. Brownish. (2) £. B. 1. 168. 
H. B. 2.241. HH. § Arn. 481. Bab. 352. Lind. 249. 
