346 



H8. TRIGLOCHIN. 



cells, tapering at the base. Valves acumiuate. 

 Root fibrous, with hai'dly any bulb. L. chan- 

 neled, p. 6, 7- Moist and hoggy meadows. 



2. laxiflorum. Bulb ovate, closely co- 

 vered with anastomosing fibres. Caps, conoi- 

 deo-subulate, 3-celled. Valves obtuse. L. flat. 

 p. 9-11. Mountain meadows and sea-shore. 

 Sic. Cors. Var. of Sp. 3 ? 



3. Barrelieri. Bulbs clustered, oblong. 

 L. semicylindrieal, channeled. Caps, conico- 

 subulate, 8-ceUed, striate. Valves obtuse, p. 

 4, 5. Salt marshes. It. w. Fr. 



4. maritimuxu. L. semicylindrieal. Caps, 

 ovate, of 6 cells, p. 6, 7. Salt marshes. 



XCYIII. EEIOCAULE^. 



Flowers separate in the same head. Perianth glumaceous, 2-6-partite. Stamens 2-6. 

 Ovaiy superior, 2-3-ceIled. Ovules solitary. Dehiscence of Capsule between the partitions. 



Seeds coated with vrings or rows of hair 



749. ERIOCAULON. 

 1. septangulare. Scape 7-edged. L. 



acuminate, cellular, 

 tal and 4 anthers. 

 Connemara. 



Barren Flowers of 1 pe- 

 p. 8. Featy lakes. Skye. 



XCIX. POTAME^. 



Flowers complete (except in Zannichellia) . Perianth inferior, 4-parted, or 0. Stamens 1, 

 2, or 4. Ovaries 1 or 4, distinct, each crowned with the pistil, and containing 1 seed. Fruit 

 not bursting. No Albumen. 



upperaiost opposite. 



750. POTAMOGETON. 



"The fruit of Potamogeton shrivels vari- 

 ously, and puts on different appearances in 

 drying. It is, therefore, the fi-esh fruit which 

 is to be attended to, and which is always meant 

 in the following descriptions, unless the con- 

 trary is mentioned."^ Koch (whom I have 

 generally followed in this genus). 



A. L. aU stalked; 

 floating. 



i. Flower-stalks in the axils of the coria- 

 ceous floating leaves only. Sp. 1-5. 



ii. Flower-stalks also in axils of submersed 

 L. Sp. 6-11. 



B. L. all similar, alternate, membranous, not 

 floating on the surface. 



i. L. lanceolate or broader. Sp. 12-18. 



ii. L. linear or narrower. 



a. Stipules free. Sp. 19-24. 



b. Stipules joined to L. Sp. 25-27- 



C. L. all similar and opposite. Sp. 28. 



A. Lower L. alternate ; 2ippermost opposite, 

 floating, coriaceous : all stalked. 



i. Flower-stalks fro7n floating L. only. 



1. natans. Fr. about 2 lines long, round 

 at back. Floating L. ovate or elliptic. Stalk 

 flat, or hollow on upper surface. Lower L. 

 very narrow, sometimes setaceous (perishing 

 before the flowering, Koch), p. 6, 7. Still 

 water. According to Koch, all the L. are 

 stalked. Sm. says that the lower are sessile. 



2. oblon^us. Fr. about 1 line long. Back 

 round. Floating L. eUiptico - oblong ; (upper 

 somewhat cordate, Koch.) Stalk flat, or hol- 

 low on upper sm'face. Lower L. lineari-lan- 

 ceolate (remaining at time of flowering, Koch). 

 p. 7. Boggy. 



3. fluitans. Edges of Fr. subacute. Float- 

 ing L. oval, or oblongo-lanceolate, without a 

 fold at the base. Stalks convex above. Fruit- 

 stalk cylindrical, p. Rivers. Sw. northern 

 Rhine. According to Nolle, the Spike-stalk is 

 thickened and hollow ; hut this is not admit- 

 ted by Koch. 



