Ord. 1.] DIANDRIA MONOGYMA. 7 



Bogs. If. 6, 7. Hairy. Fl. pale lilac, with a yell, throat. 

 *\. P. alpina, Suppl. 2747. (Alpine B.) Nectary conical, shorter 



than the irregular petal, and curved towards the lower retuse 



lip. Flower-stalk glabrous. 

 Bogs, Scotl., rare. If. 6. Cor. yellowish, with a tuft of deep yell. 



hairs within. 



2. P. vulgaris, 1. 70. (Common B.) Nectary cylindrical, acute, as 



long as the very irregular petal. Segments of the calyx ob- 

 long. Capsule ovate. 

 Bogs. If . 5, 6. Smooth, larger. Fl. violet. Stigma with a spur. 



3. P. grandiflora, 31.2184. (Large-flowered B.) Nectary cylin- 



drical, acute, as long as the nearly regular petal. Segments of 

 the calyx ovate, obtuse. Capsule ovate. 

 Bogs, S. of Irel. If. 5, 6. Cor. 5-cleft, twice as large, with blue veins. 



11. UTRICULlRIA. Bladderwort. 



1. U. vulgaris, 4. 253. (Greater B.) Spur conical. Stalks straight. 



Cluster somewhat corymbose. Upper lip of the corolla as long 

 as the palate, reflexed at the sides. 

 Ditches and pools. If. 7. Floating, branched, bladdery. Fl. 

 large, yell. 



2. U. intermedia, 35. 2489. (Intermediate B.) Spur conical. Stalk 



two- or three-flowered. Upper lips of the corolla flat, twice as 

 long as the palate. Bladders separate from the leaves. 

 Ditches, Ir. and Scot. If. 7. L. in deep, forked, flat segm. 

 Bladders fewer. 



3. U. minor, 4. 254. (Lesser B.) Spur keeled, very short, obtuse, de- 



flexed. Cluster of few flowers. Corolla ringent; palate nearly 

 flat ; lips undivided. 

 Ditches and marshes, rare. If. 7. Smaller. Bladd. more numer. 

 attached. Fl. small, yellow. 



12. LeMNA. Duckweed. 



1. L. trisulca, 13. 926. (Ivy -leaved D.) Fronds stalked, elliptic- 



lanceolate, proliferous. 

 Pools.0.6. Floating, of ten waved or toothed, pale green. Fl. white. 



2. L. minor, 16. 1095. (Lesser D.) Fronds obovate, flattish above 



and beneath. Roots solitary. 

 Ponds. ©. 6, 7. Leaves ( or fronds) small, connected in floating 

 masses. Fl. rare. 



3. L. gibba, 18. 1233. (Gibbous D.) Fronds obovate ; slightly con- 



vex above ; hemispherical beneath. Roots solitary. 

 Ponds. 0. 6, 7. Larger, vascular; reticulated beneath ; purplish 

 above. 



4. L. polyrrhiza, 35. 2458. (Greater D.) Fronds roundish-obovate ; 



convex beneath. Roots clustered. 

 Ditches. .7,8. Much larger, purplish beneath. Roots of many fibres. 



