TRIANDRIA. 



(6) 



TRIANDRIA. 



VAGINARIA Spike ovate; calycine scales imbricated on 

 all sides, acutely acuminated ; corolla none ; stigmas 

 three ; involucel of the seed formed of three chaffy awn- 

 less scales, alternating with three slender setse. 



VALERIANA, Valerian Calix none; corolla one-petalled, 

 gibbous on one side of the base, superior; seed one. 



WATSONIA Spathe of two-valves ; corolla tubular, with a 

 cylindrical throat, its border in six deep, nearly equal seg- 

 ments ; stigmas three, thread-shaped, deeply cloven, the 

 segments recurved ; capsule cartilaginous ; seeds numer- 

 ous, angular. 



XIPHIDIUM Corolla regular, of six petals ; capsule supe- 

 rior, of three cells, with many seeds. 



2. DIGYNIA (Two Pistils.) 



CORNUCOPIA, Horn-of-plenty Grass Involucre one-leafed, 

 funnel-form, crenate, many-flowered ; calix two-valved ; 

 corolla one-valved. 



SACCHARUM, Sugar Cane Calix two-valved, involucred, 

 with a larpe lahugo; corolla two-valved. 



PANICUM, Panic Grass Calix two-valved, the outer valve 

 very small. Or, Calix of two very unequal leaves, con- 

 taining two flowers, the outer one male, or neuter ; corolla 

 of two unequal valves, finally cartilaginous, and investing 

 the seeds. 



PHLEUM, Cat's-tail Grass Calix two-valved, sessile, linear, 

 truncated, with a two-cusped lip; corolla enclosed. 



ALOPECURUS, Fox-tail Grass Calix two-valved ; corolla 

 one-valved. 



MILIUM, Millet Grass Calix two-valved, one-flowered ; 

 valves almost equal ; corolla very short ; stigmas pencil- 

 form. 



AGROSTIS, Bent Grass Calix bivalved, one-flowered, a little 

 less than the corolla; stigmas longitudinally hispid. 



AIRA, Hair Grass Calix two-valved, two-flowered, without 

 any rudiment of a third. 



MELICA, Melic Grass Cali-x two-valved, two-flowered, with 

 the rudiments of one or two florets that are abortive, 

 between the two others. 



POA, Meadow Grass Calix two-valved, many-flowered ; 

 spikelets ovate; valves scariose at the edge, and sharpish. 



BRIZA, Quaking Grass Calix bivalve, many-flowered ; spike- 

 lets distich, with heart-shaped obtuse valves, the lower of 

 which is minute. 



UNIOLA, Panicled Spike Grass Calix many-valved ; spike- 

 let ovate, keeled. 



D ACTYLIS, Cock's-foot Grass Calix two-valved, compressed ; 

 one valve larger, keeled, 



CYNOSURUS, Dog's-tail Grass Calix two-valved, many- 

 flowered ; receptacle proper, unilateral, leafy. 



FESTUCA, Fescue Grass Calix of two valves; spikelet ob- 

 long, somewhat cylindrical, two-ranked, with sharp- 

 pointed glumes. 



BKOMUS, Brome Grass Calix two-valved; spikelet oblong, 

 columnar, distich ; awn below the top. 



STIPA, Feather Grass Calix two-valved, one-flowered ; 

 corolla, outer valve with a terminating awn, jointed at 

 tlie base. 



AVENA, Oats Calix two-valved, many-flowered; awn from 

 the back of the corolla, jointed, twisted. 



LAGURUS, Hares-tail Grass Calix two-valved, with a vil- 

 lose awn; corolla having on the outer petal two termi- 

 nating awns, and a third dorsal one, twisted back. 



ARUNDO, Peed Calix two-valved ; florets heaped, sur- 

 rounded with wool. 



ARISTIDA, Oat Grass Calix two-valved ; corolla one-valved, 

 with terminating awns. 



LOLIUM, Darnel Calix one-leafed, fixed, many-flowered ; 

 glume opposite the shaft. 



ELYMUS, Lyme Grass Calix lateral, aggregate, of two- 

 valves, containing many florets. 



SECALE, Rye Calix two-valved, solitary, two-flowered, on 

 a toothed elongated receptacle. 



HORDEUM, Barley Calix lateral, two-valved, (valves narrow, 

 acuminate, distant, all together forming a six-leaved invo- 

 lucre,) one-flowered, by threes at each toothlet of the 

 rachis. Or, Common receptacle toothed and excavated ; 

 calix lateral, ternate, two-valved, single-flowered. 



TRITICUM, Wheat Calix two-valved, solitary, subtriflorous, 

 or many-flowered, on a flexuose toothed rachis ; corolla 

 blunt, with a point. 



PHALARIS, Canary Grass Calix two-valved, keeled, the 

 valves equal in length, enclosing the corolla. 



PASPALUM Calix two-valved, orbicular; corolla of the 

 same size; stigmas pencil-shaped. 



ROTTBOJLLIA. See Polygamia Moncecia, 



# * # # ' * * * # * * 



ANTHEROPOGON Flowers polygamous, in unilateral spikes; 

 calix two-va'.ved, two-flowered ; hermaphrodite corolla 

 two-valved, exterior valve three-awned, intermediate bi- 

 dentate; neutral corolla of one valve, with three exserted 

 awns ; seed naked, oblong, compressed, with a longitudinal 

 furrow. 



ANTHOFOGON Flowers polygamous, irregularly alternating 

 upon setaceous spikes disposed in a panicle; calix two- 

 valved, two-flowered ; corolla hermaphrodite, two-valved, 

 outer valve terminated by a long and straight awn ; 

 seed linear-oblong, internally marked with a longitudinal 

 furrow. 



ANTHOXANTHUM, Sweet Vernal Grass Calix glume two- 

 valved, one-flowered ; corolla glume two-valved, acumi- 

 nate ; seed one. 



AULAXIA Calix two-valved, one-flowered, with the rudi- 

 ment of a second ; valves equal, furrowed, the furrows 

 villose ; corolla two-valved ; valves nearly equal. 



DIANTUUS, Pinks. See Decandria Digynia. 



LEARSIA Calix none; glume two-valved, closed. 



MUHLENBERGIA Calix one-valved, minute, lateral ; corolla 

 two-valved. 



PAPPOPHORUM Calix two-valved, two-flowered ; corolla 

 two-valved, many-awned. 



PEROTIS Calix t.wo equal awned valves ; corolla two n.inute 

 awnless valves ; style deeply divided. 



PHLEUM, Cat's-tail or Timothy Grass Calix two-valved, 

 sessile, linear, truncated, with a two-cusped lip ; corolla 

 enclosed. 



PICRAMNIA. See Dicecia Pentandria. 



XEUOCIILOA Calix two-flowered, of two unequal valves; 

 corolla of both flowers longer than the calix, of two 

 valves, awl-shaped, membranaceous, awnless ; stamens in 

 the outermost flower; nectary none; seed enclosed in the 

 inner paper-like valve of the corolla. 



ZENGITES, Yoke Grass Common calix of two valves, with 

 three flowers, the female one sessile, the males stalked; 

 corolla of the males, of two beardless valves ; of the female, 

 of one awned valve; style divided; seed oblong. 



ZOYSIA Calix of one valve, single-flowered, compressed, 

 cartilaginous; corolla of two membranous valves within 

 the calix; stigmas feathery; seed linear, invested with 

 the glumes. 



TRICHODIVM Calix two-valved ; valves nearly equal, acute; 



