GLUMIPEKOUS MONOCOTYLKDOXOrS A\(iIOSPERMS. 11 



COHORT VI. GLUMIFEROUS MONOCOTYLEDONOUS AWGIOSPERMS. 



P'loral envelope chaff-like or wanting, mostly herbaceous. 



Stem cylindrical, tapering, and hollow, with closed joints. Leaves alternate, 

 sheathing, sheath split opposite the blade. Flowers glumaceous, in spikelets. 

 Perianth imperfect or wanting. Stamens iisually 3, sometimes fi. Grasses and 

 grains. 



Gramineae. 



Spikelets in twos or threes. Stamens 3. Stigmas on long tiliform styles. 



Saccharum and Sorghum in Gramineae. 

 Spikelets all fertile in a panicle. Stamens 6, sometimes 3. 



Oryza in Gramineae. 

 Spikelets monoecious or polygamous, in a spicate panicle. Stamens 2-3. Styles 

 elongated filamentous. 



Zea in Gramineae 



Spikelets all fertile in a panicle. Stamens 3. Stigmas sessile. 



Avena in Gramineae. 

 Spikelets all fertile. Glumes 2, seldom 1, varying in length. Stamens 3, rarely 

 1. Stigmas sessile, or nearly so. 



Triticum, Hordeum, and Secale in Gramineae, 



Class TIL 



COHORT Vn. CONIFEROUS GYMWOSPERMS. 



Cone-bearing plants, mostly trees. Juice resinous. Leaves awl- or needle-shaped. 

 No calyx or corolla. Pistil on an open scale. Ovules naked. 



Coniferae. 



