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TETRANDRIA. 
HIPPO'PHAE. Flowers barren and fertile on distinct plants. 
Bloss. none. 
B. Cal . with two divisions. 
F. Cal. two cleft: Berry one seeded. 
[Thesium alpinum. Ophrys Corallorliiza.] 
DIGYNIA. 
BUFFO'NIA. Bloss. four petals : Cal . four leaves : Caps, one 
cell; two seeds and two valves. 
(AL'NUS. Flowers barren and fertile on the same plant. Pe¬ 
ricarp naked, not winged as in Betula. E.) 
BET'ULA. Flowers barren and fertile on the same plant. 
Cal. three cleft: Bloss. with three divisions. 
B. Cal. containing three flowers. 
F. Cal. containing three flowers : Seeds compressed, 
solitary, with a membranous border on each side. 
MYRI'CA. Flowers barren and fertile on the same, or on dis¬ 
tinct plants. Catkins scales concave, crescent-shaped: 
Bloss. none. 
F. Berry one-seeded. 
CUS'CUTA. Bloss. four-cleft; companulate : Cal. four-cleft : 
Caps, two-celled ; cut round. 
[Herniaria glabra. Gentiana campestris and filiformis. Galium mol- 
lugo and Aparine.] 
TRIGYNIA. 
BIJX'US. Flowers barren and fertile on the same plant. 
B. Cal. three leaves : Bloss. two petals: Germen an 
imperfect rudiment only. 
F. Cal. four leaves : Bloss. three petals : Caps, with 
three beaks and three cells : Seeds two. 
TETRAGYNIA. 
FLEX. Bloss. one petal, wheel-shaped : Cal. four-toothed : 
Berry four seeded: Style none. 
SAGFNA. Bloss „ four petals : Cal. four leaves : Caps, one 
celled, four valved, with many seeds. 
(MOEN'CHIA. Pet. four: Caps, one-celled, and one-valved, 
with eight teeth. Cal . four-leaved* E.) 
