103 CLASS XX. ORDER III. 



calyx-glume 1 -flowered, covered with a 1 -leafed 

 involucre perforated with hollows : corol-glume 2- 

 valved: styles 2 : seed 1. 4. 10 — dactyloidea (se- 

 same grass) spikes ternate. 11. 



Coix. Staminate flowers — in remote spikes : ca- 

 lyx-glumes 2 flowered, awnless : corol-glume awn- 

 less. Pistillate flowers — calyx-glume 2-flowered : 

 corol-glume awnless : style 2-partcd : seed cover- 

 ed with the bone-like calyx. 4. 10 — lacryma (Job's 

 tear) culm branched, leaves wrinkled, seeds ovate. 



Carex. Aments imbricate (usually in cylindric 

 spikes.) Staminate flowers — calyx-scales solitary : 

 corol 0. Pistillate flowers — calyx-scales solitary : 

 corol inflated, monopetalous, 2-toothed at the apex : 

 stigmas 2 or 3 : nut 3-sic:ed, inclosed in the per- 

 manent corol, which becomes an utriculus-like per- 

 manent aril. 3.9 — Stigmas 2, stamens and pis- 

 tils IN DISTINCT SPIKES — coesfiitosa^ (hog sedge) 

 pistillate spikes about in threes, lower one very 

 short, aril longer than the obtuse scale — criniia, 

 staminate spikes in pairs, pistillate spikes in fours, 

 aril shorter than the awned scale — Stigmas 2, 



SPIKES SEVERAL, ANDROGYNOUS, WITH STAMINATE 



FLORETS ABOVE — stifiata^ aril bi-cuspidate plano- 

 convex nerved, culm very rough, spikelets oblong 

 about in fives — ^laniculata^ aril with ciliate-serrate 

 margin, spikes panicled. — Like the last, except 

 WITH pistillate floretsp ABOVE — scir/ioides^ 

 spikelets about in fours, aril ciliate-serrate — -festu* 

 cacea (fescue sedge) spikelets about in eights, aril 

 ciliate-serrate. ^Stigmas 3, spikes androgynous 

 with staminate florets above — fie dune ulata^ 



\ Fifty-five species of Carex have been examined and des- 

 cribed in the Northern States. It is therefore very difficult 

 to select the most common, in conformity with our plan. — 

 We have inserted none but those found most common near 

 Yale College by the author, and nesu: WiUiions' College by 

 Professor Dewey. 



