Old. 3.] MONOECIA TETRANDRIA. 189 



Scales pointed. Sheaths nearly equal to the short flower-stalks. 

 Fruit .ovate, hairy, with a deeply cloven beak. Leaves linear, 

 channelled, smooth. 

 Boggy mead. If. . 6. About 2f. smooth. L. narrow. Sp. blackish. 



428. KOBReSIA. Kobresia. 

 [Habit like Carex.~\ 



1. K. caricina, Schcenus monoicus, 20. 1410. (Compound-headed 

 Kobresia.) Catkins aggregate, crowded, alternate. — Elyna cari- 

 cina, Br. Fl. 

 Mts., N. of Engl, and Scotl., rare. "4 . 8. Stem 3—6 in. L. radical, 

 linear. 



MONOECIA TETRANDRIA. 



429. LITTOReLLA. Shore-weed. 



1. L. lacustris, 7. 468. (Plantain Shore-weed.) 



Wet sandy pi. If. 6. Stem 0. L. linear, fleshy, 3 — 4 in. Barr.fl. 

 stalked. 



430. ALNUS. Alder. 



1. A. glutinosa, Betula Alnus, 21. 1508. (Common Alder.) Leaves 

 roundish-wedge-shaped, wavy, serrated, glutinous, rather abrupt; 

 downy at the branching of the veins beneath. 

 Watery pi. T? . 3,4. Wood reddish. Br. spread. Fert. cat. roundish. 



BtfXUS. Box-tree. 



1. B. sempervirens, 19. 1341. (Common B.) Leaves ovate, convex. 

 Anthers ovate-arrow-shaped. 

 Dry chalky hills. T? . 4. L. entire ; their stalks slightly downy. Fl. 

 pale yellow. 



432. URTlCA. Nettle. 



1. U. pilulifera, 3. 148. (Roman N.) Leaves opposite, ovate, ser- 



rated ; with transverse ribs. Fertile flowers in globular heads. 

 Waste gr. chiefly near the sea. ©. 6, 7. 2/. stinging virulently. 



2. U. urens, 18. 1236. (Little N.) Leaves opposite, elliptical, with 



about five longitudinal ribs. Clusters nearly simple. 

 Cult, gr, 0. 6 — 10. Smaller, bright green ; stings less virulent. 



3. U. dio'ica, 25. 1750. (Great N.) Leaves opposite, heart-shaped. 



Clusters much branched, in pairs, mostly dioecious. Roots creep- 

 ing. 

 Waste gr. & hedges. If, 7, 8. Bull gr., 3f. with less irnt. stings. 



