(72) 
5. Zannichellia.—Flowers axillary. 4 flower 
naked, ? flower with campanulate per- 
igonium. Ovaries 4, each 1-ovulate. 
Fruit nutlets. Aquatic. 
6. Callitriche.—Flowers axillary, 2-bracteo- 
late. Ovary 4-celled; cells 1-ovulate. 
Fruit a 4-coccous schizocarp. Aquatic. 
Il. Diandria. ; 
1. Pinus.—Anthers sessile on the bracts of 
the $ amentum. Leaves fasciculate in 
asheath. Coniferous. 
2. Pseudotsuga.—Anthers sessile on the 
-bracts of the 6 amentum. Leaves dis- 
tichous. Branchlets smooth, the leaf 
scars not being prominent. Coniferous. 
3. Fraxinus.—Flowers paniculate. Calyx 
obsolete, 4-cleft. Fruit a 1-seeded sa- 
mara. 
III. Triandria. 
1. Typha.— 4 spikeand ? spike cylindrical. 
8 spike above ? spike. Palez 0. 
2. Sparganium.—é spike and 2 glomeru- 
late. Flowers separated by a palea- 
ceous perigonium. Aquatic. 
3. Carex.—Glumaceous. Spikes unisexual 
or androgynous. Spikelets 1-flowered. 
6 spikelet an external palea; ¢ spike- 
let with 2 palew, the interior one trans- 
formed into a utricle includiug the 
1-seeded ovary. 
