POTAMEiE. 



349 



tuse. Stip. intrafoliaceous, very short, trun- 

 cate. Mowers under water. Sea or sandy 

 shores. Mdt. 



755. ZOSTERA. 



1. marina. Monoecious. Anthers sessile. 

 L. 3 -nerved. Stalk of Sheath broader up- 

 wards. Seeds striate, p. 8. In sandy or 

 muddy creeks. 



2. nana. Monoecious. Stalk of Sheath of 

 even breadth. L. 1 -nerved, not exceeding 

 length of a finger. Seeds sessile, striate, p. 



7, 8. In the sea, on sand. Isl. of Nor- 

 demey. Poole. Chichester creek. 



3. nodosa. " Monoecious. Stem exten- 

 sively creeping, somewhat 2-edged, not thick- 

 ened at the joinings, covered by the sandy 

 mud. L. 2-12 in. long, emargiiiate, nerved; 

 lower quickly perishing, p. 7- Sea and salt 

 pools. Sic." — Guss. 



756. PHUCAGROSTIS, 



1. major. Stem creeping. L. grass-like. 

 p. 7- Muddy shores, s. Fr. Sic. 



C. LEMNACEiE. 



Prond floating, without distinction of stem or leaf. Flowers from the margin. Anthers 2. 

 Fruit bladdery, not hm-sting. 



757. LEMNA. 



1. trisulca. Fronds lanceolate, serrate at 

 top, transversely proliferous. FU. recurved, 

 filiform, a. 6 (4, 5, Koch). Stagnant. 



2. minor. Fronds obovate, nearly flat on 

 both sides, proliferous. Root solitary, a. 6, 

 7 (4, 5, Koch). Stagnant. 



3. arrliiza. Fronds elliptic or subrotund, 



conves beneath, without roots, a. Stagnant. 

 Fr. Spa. Cors. 



4. polyrrhiza. Fronds obovate, subrotund. 

 Roots numerous, clustered. Fil. narrowed 

 below, a. 4, 5. Stagnant. 



5. ^ibba. Fronds obovate, convex above, 

 hemispherical beneath. Root solitary, a. 6, 



7. Stagnant. 



CI. OECHIDE^. 



Filaments and Style united into a common column. Anther 1, composed of 2 separate 

 parts, each of a single cell ; or 2 in Cypripedium. Sepals 3, usually coloured. Petals 3 ; one 

 generally of a diiferent form and larger, in some genera with a posterior spui-, or bag. Caps, 

 inferior, opening by 3 longitudinal clefts. 



758. LIMODORUM. 



1. abortivum. Leafless. 

 ing. Label ovate, undulate. 



Scales sheath- 

 p. 5, 6. Dry 



thicTcets. m. and s. Eur. Scattered. 



2. sphserolabium. " Bulbs fasciculate, fili- 

 fonn. Stem scaly, nearly leafless. Bracts 

 shorter than germen. Sep. and Pet. nearly 

 equal in length, the latter narrower. Label 

 rounded (not ovate or elliptic), somewhat un- 

 dulate, narrowest at base, channeled. Spur 

 cylindrical, as long as germen. Bonifacio." — 



ViVIANI. 



759. EPIPOGIUM. 

 1. Gmelini. Leafless. Scales sheathing. 



Fl. few, drooping, p. 7, 8. Mountain woods, 

 on rotten wood. rare. G. Sc. Fr. 



760. ORCHIS. 



A. Label coiled in the bud ! Sp. 1. 



B. Germen twisted. Glands in a pouch, 

 imited. Sp. 2. 



C. Germen twisted. Glands in a pouch, or 

 fold of the stigma, not united. 



i. Tubers simple. 



a. Label undivided, dentate. Sp. 3-6. 



b. Label 3-lobed : lateral di\dsions as 

 broad as midivided middle. Sn. 



7, 8. 



