TRIAXORIA. DIGYxMA. 81 



cludod by the ralix. Masculine and neutral ca- 

 lix, uniform or leguliir. 



Flowers imbiicaf^d in an articulated, unilateral, com- 

 pressed racliis; the nhiscuiine and hermaplirodi e flowers 

 intermixed. 



Species. 1,M. ^rojitikvis. (On the sea-coast of Caro- 

 lisia and iieoi-.t(,a. Mich.) 



A genus oi Iiulia and America within the tropics, con- 

 sisting of 2 species. 



113. LEPTLRLS. /2. Z?roYtJ?i. (Rotbollia, spe- 

 cies, friud.) 



Flower's poly.i^amous. spiked. Rachis articu- 

 Jateil, filiform; aiticulatioiis singK-tiijwcred. — 

 Ccdix fixed, or growiiiji^ to J he rachis, 1 or 2- 

 valved, the valve simple, or hiparted. 



With the precise characters of this genus, as described 

 by Ml'. R. lirowiij 1 am unacqiiainted, but satisfied with 

 the pr.jprirty of separating plan;s of such dissimilar ha- 

 bits, as .ave been iiilherto refeifed to BotboUia, I have 

 ventured to give it, however imperft^cvly. 



SpECTEs 1. J,. *paniculatns. Uachis incurved, com- 

 pounded, acu'el\ triangular, branches and summit flower- 

 beaiing; spikes on one side, subulate, compressed, unila- 

 teral; calix 2-vahvd, acuminate, l-flowered; flowers all 

 hermaphrodi'e, 2-v^^lved. 



Obs. Annu.i. Culm scarcely a foot high, roundish, 

 compressed, le^tves siiort, rij^id, sheaihing tlie base of 

 the panicl- ; panicle or naked rachis, slender, rigid, angu- 

 lar, bearing 6 to 10, com[)i-essed, subulate, spikt^s on one 

 side, not soluble or fragile at the articulations, each 1 or 

 2 inches Icng; flowers remote, on one side ot the rachis. 

 Calix rigidly fixed, of 2 unequal parallel valves closing 

 the scrobiculum; flower 2-valved, the exterior valve re^ 

 sembhng the calix, the interior membranaceous. 



On dry saline plains, near Fort Mandan, on the Mis- 

 souri. Flowering in June. 



114. =5«=ANTH0P0G0N.t (Andropogon amhi- 

 guniHn Mich.) 



Flowers polygamous, irrcgidarly alternating 



■f From XV 6 Oi,, a. Jl'jiver and TT My &)v, a beard. The ncairal 

 rudiment going out into a long awn 



