CHAPTER XV 
TrisE I. MAYDE 
This tribe is scarcely more than a division of the next 
tribe, Andropogonez, from which it differs in the sepa- 
ration of the staminate and pistillate inflorescences. The 
structure of the spikelets in the 2 tribes is similar. 
Key TO THE GENERA OF MAYDE% 
A. Staminate and pistillate spikelets in separate 
inflorescences, the former in a_ terminal 
tassel, the latter in the axils of the leaves. 
B. Pistillate spikes distinct, articulated........EUCHL#NA 
BB. Pistillate spikes grown together forming (Par. 201). 
RE PSMA Ot cola: 5,2 a tk chic ee VE ZEA (Par. 202). 
AA. Staminate and pistillate spikelets in separate 
portions of the same spike, the pistillate 
below. 
B. Spikes short, the 1- to 2-flowered pistillate 
portion inclosed in a bead-lke sheathing 
RCA oS hg crates Aa eet bee ee nee Corx (Par. 203). 
BB. Spikes many-flowered, the pistillate portion 
breaking up into several 1-seeded joints; 
no bead-like sheathing bract.............TRIPSACUM 
(Par. 200). 
200. Tripsacum L.—The terminal inflorescence con- 
sists usually of a cluster of spikes the lower portions of 
which are pistillate and the upper portions staminate. 
The pistillate portion consists of a series of joints which 
disarticulate at maturity forming bony cylindrical or 
angled seed-like parts made up of the thick axis and an 
imbedded spikelet. The spikelet consists of a hard first 
glume which closes the spikelet within the joint of the 
rachis, a thinner second glume, a sterile lemma with a 
(159) 
