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C. Floral parts glumaccous. 
aa. Spikelets distichous. 
1. Cyperus.—Gluma ©, one or the two 
lowermost smaller and empty. 
bb. Spikelets imbricate on all sides. 
1. Eleocharis.—Perigonial bristles not ex- 
serted. Caryopsis apiculate by the per- 
sistent articulate base of the style. 
2. Fimbristylis.—Perigonial bristles not 
exserted (sometimes wanting). Caryop- 
sis apiculate by the persistent contin- 
uous base of the style. Aquatic. 
3. Scirpus.—Perigonial bristles not exserted 
(sometimes wanting altogether). Cary- 
opsis apiculate by the persistent contin- 
uous base of the style. Aquatic. 
4. Eriophorum. — Perigonial bristles ex- 
serted, considerably longer than the 
glume. Aquatic. 
Observation.—All grasses which are mon- 
ogynous are put in Triandria Digynia. 
I. Digynia. 
A. Flowers glumaceous. 
a. Spikelets single 1-flowered, imbedded in the 
notches of the rachis, each covered by its 
glume. 
1* 
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