590 (juamink.t:. (cuass kamiia.) 



iiulmlod in tlio slieatlis uf tlie upper leaves, tlie iij)per one staminate and ex- 

 Sertoli. (Iliiines 2, liyaline, the lower one eniarj;iuate, tlie upper acute. I'alet 

 none. Stamens (>. Styles 2 : stigmas elongated. Clraiu ovoid, free. 



I. H. Carolinensis, Heauv. (Zizania fluitans, il//f7(.r.) — Floating in 

 still water or eree])ing on muddy hanks, Florida to North Carolina. July- 

 August. — Ciilni (ilil'onn, hramliing, ^^-2° loug. Leaves 1' -2' long. 



15. ZIZANIA, Grouov. Wild Kick. 



Rank water grasses, with hroad flat leaves, and large diffii.se panieles of 

 monueeious l-flo\vered s))ikelots, on elul)-shai)ed jointed pedicels. Glumes 2, 

 memhranaeeous, the lower one of the pistillate spikidet.s avvned. Stamens 6. 

 Stigmas elongated, brush-shaped. Grain cylindrical, free. 



1. Z. aquatica, L. Spikelets of the lower portion of the panicle stami- 

 nate, of the upper pistillate; awn straight, elongated; styles 2; grain linear. 

 — Deep marshes and ponds, common. July. — Culms 4° -8° high. Leaves 

 rough heneath. Panicle l°-2°long. 



2. Z. miliacea, Michx. Panicle diffuse ; staminate and pistillate spike- 

 lets intermixed ; awns short; styles united, elongated ; leaves smooth, with 

 rough mai'gius; grain oval. — With the preceding. April -May. — Culms 

 4° - 6° high. Leaves somewhat glaucous. 



16. PHARUS, P. Browne. 



Aquatic grasses, with hroad flat leaves, petiole-like sheaths, and monoecious 

 flowers disposed in a simple terminal panicle. — Spikelets ])y ])airs, une(|ual, 

 the smaller pedicelled, hexandrous, the larger pistillate, witii the flowering 

 glume iiulurate<l, involute. Empty glumes 2, thin. Style long ; stigmas 3. 

 Grain linear, included. 



1. P. latifolia, L. Floating; leaves oblong, rough beneath, longer than 

 the sheath ; flowering glume pointed, downy on the back, twice as loug as the 

 lanceolate empty glumes. — Orange Lake, Florida ( llerh. Thurber). 



17. ROTTBCELLIA, L. f. 



Erect perennial mostly tall grasses, with flat or chaiinellod leaves, and spiked 

 inflorescence. Spikps nearly terete, jointed. Spikelets awnlcss, in pairs at 

 the base of each joint ; one imperfect, on a coriaceous and closely appressed 

 pedicel ; the other perfect, sessile, embedded in an excavation of the joint, 2- 

 flowered. Glumes 4, the exterior flat, coriaceous, with a hinge-like depressicm 

 at the hase, the interior hoat-shaped, membranaceous. Palets hyaline. Sta- 

 mens 3. Styles 2. Grain compressed, free. — Spikes solitary on lateral and 

 terminal peduncles or branches. 



1. R. rugOSa, Nutt. Culms compressed ; peduncles or branches in pairs, 

 short, included in the sheaths of the upper leaves; spikes spreading, .slightly 

 compressed ; lower glume lanceolate, transversely rugose ; sterile flower neu- 

 tral. — Pine harren swamps and ponds, Florida to North Carolina. Sept. — 

 Culms 2° -4° high. Spikes green, 1^-2' long, 1" in diameter. 



