CLASS XX, ORDER III. lOl 



growing immediately from the under surface of the 

 leaves, and the flowers from their upper surfaces. 

 Found in great abundance near Williams' College. 

 PoDosTEMUM. Staminatc flowers — calyx : co- 

 rol 0: stamens affixed to a pedicel. Pistillate flow- 

 ers — calyx : corol : germ ovate : stigma Ij ses- 

 sile : capsule 2-celled, 2-valved, many-seeded. 54.6 

 — ceratofihyllum (thread- foot) stem filiform floating^ 

 leaves pinnate, flowers axillary. 



Order III. Triandria. 



Typha. Amentcylindric. Staminate flowers- 

 calyx obsolete, 3-leaved : corol 0. Pistillate flow- 

 ers — below the staminate : calyx : corol : seed 

 1, pedicelled ; the pedicels surrounded at the base 

 with long hairs resembling egret. 3. 8— /c^f/b/fa 

 (cat-tail, or reed mace) staminate and pistillate 

 spikes near or adjoining, leaves sub-ensiform. 11- 

 '^-angustifolia^ staminate and pistillate spikes re- 

 mote, leaves half- cylindric. V. 



SpARGANiuM. Staminate flowers — ament round- 

 ish : calyx 3-leaved : corol 0. Pistillate flowers- 

 calyx 3-leaved : corol : stigma 2-cleft ; drupe 

 juiceless, 1 -seeded. 3. 8 — ramoaum (burr-reed) 

 leaves 3-sided at the base, common peduncle 

 branched. %, g-w.- — stJnfilex^ common peduncle 

 simple. 1^- 



Zea. Staminate ffowers — calyx-glume 2-flow- 

 ered, awnless ; corol-glume awnless. Pistillate 

 flowers — calyx- glume 2-valved : style 1, filiform, 

 pendulous : seed solitary, immersed in an oblong 

 receptacle. 4. 10 — mays (Indian corn) leaves entire 

 linear-lanceolate keeled. 0'g. Var. ^re-cox (sum- 

 mer corn) small and ripens in the summer. 



Tripsacum. Staminate flowers— calyx-glume 

 2-flowered, outer one staminate, inner one neutral ; 

 corol-glume membranaceous. Pistillate flowers— 



