xviii GENERA. 



cloven. Seed 1. ChenopodiEj^s. Herbaceous. Fl. small, sessile, axillary. L. subulate, 

 somewhat 3'-edged. p. 314. 



Atriplex. Amaranthus. 



754. CAITLINIA. Cal. 0. Cor. 0. Eil. dilated, persistent, bearing the Anthers at the 

 base externally. Fr. a 1-seeded berry. Potame.e. p. 348. 



Ea. Fl. inferior, glumaceous, of a single scale ; covering, not in itself including, the organs. 

 Seed 1. Plants grass-like, but not exhibiting knots on the stem. Cypeuace^. 



825. CYPEEUS. Spikelets many- flowered. Scales in 3 rows, alike, not crowded, nearly 

 all fertile. Seeds without bristles, p. 379. 



826. SCHCEBTUS. Spikelets 1-3-flowered. Scales in 2 rows, crowded; outer smaller 

 and empty. Style without joinings, deciduous, p. 380. 



828. EHYNCHOSPOEA. Spikelets few-flowered. Scales tiled all round ; outer smaller 

 and empty. Style bifid, with an expanded, persistent base. Seed with bristles at base. p. 381. 



830. SCmPUS. Scales tiled all round, alike, or the lowest rather larger, nearly all fertile. 

 Germen tipped with the filiform base of style, p. 381. 



831. FIMBEISTYLIS. Scales tiled aU round ; lower larger, 1 or 2 of them barren. 

 Style compressed, ciliate ; base enlarged, with a joining to the ovary, p. 383. 



829. BLYSMTJS. Spikelets in 2 rows. Scales tiled ; outer larger and empty. Style 

 persistent, not enlarged at base. p. 381. 



832. POGOWOSTYLIS. Scales tiled all round. Style enlarged and jointed at base, 

 fringed. Base of Style furnished with a long beard, p. 383. 



838. ERIOPHOKUM. Scales tiled aH round. Style simple, deciduous. Seed surrounded 

 with long, silky hairs, p. 383. 



P. Fl. of Glumes or Pales envelo'ping the organs. Seed 1, naked, superior. Stem jointed, 

 with a sheathing L. at each joint. Gkamina. 



855. LYGEUM. Fits. 2-3, in a convolute sheath. Glumes 0. Base of the Pales 

 hardening into a 2-ceUed seed-vessel, p. 398. 



913. NARDUS. Glume 0. Pales 2, terminating in a bristle, rigid, slender. Fl. in a 

 simple, unilateral, 2-rowed spike, p. 420. 



912. ECHIN"AIIIA. Spikelets sessile, in a head tiled aU round. Fits. 1 or 2, the second 

 generally barren. Outer Pale herbaceo-coriaceous, ending in several long, rigid setas. Head 

 with a laciniate involucrum. p. 420. 



11. DIGYNIA. GuAMiNA {see above). 



A. Monandrous. Psilurus. 



B. Diandrous. Coleanthus. Anthoxanthum. 



C. In Triandria Monogynia. Nardus. Lygeum. Echinaria. 



D. In Triandria Digynia. 



i. Spikelets in opposite rows, on an alternately channeled rachis. 



a. Spikelets of 2 or more Fits., all, or nearly all, perfect. 



b. Spikelets aU fertile, but with only 1 perfect Fit. 



c. Spikelets in threes, the lateral usually barren ; none with more than one perfect Fit. 

 ii. Spikelets not on such a rachis, one-flowered, with additional scales 1 



a. Spikelets in twos, sessile and stalked ; the latter barren. 



b. Spikelets in sets, sessile and stalked ; all fertile, placed in two rows on one side of a 

 flattened rachis. 



