78 DIANDRIA. MONOGYNIA, 
in the warm regions of India, of Peru, Mexico, and the 
West-Indies. About 47 species are natives of North and 
South America. 
26. COLLINSONIA, L. (Knot-root, Horse- 
weed.) 
Calix bilabiate, above 3-toothed, below bifid. 
Corolla much longer than the calix, somewhat 
funnel-formed, unequally 5-lobed; the lower 
lobe longer, lacerately fimbriate (or fringed). 
_ Stamina 2, sometimes 4. Seeds 4,5 of them 
_ MInostly abortive. — 
Leaves large. Flowers in’ terminal panicles, yellowish 
or inclining to violet, with the 2 fertile stamina ex- 
tended beyond the corolla. . ; 
Species. 1. C. Canadensis. 2. tuberosa. 3. scabra. 4. 00a 
iis. 5. anisata. 6. punctata. E. 7. verticillata. 
The C. punctata has 2 barren filaments, and the C. 
anisata is tetrandrous. (A North American genus.) In this 
genus the stamens are observed alternately to approach 
the style. 
B. Corolla superior. 
ttHt} Flowers complete. 
27. CIRCA. L. (Enchanter’s Nightshade.) 
Calix short, 2-parted, Petals 2. Stigma emar- 
ginate. Capsule ovate, hispid, 2-celled, not 
opening; cells 1-seeded, 
Herbs; with opposite leaves; flowers alternate, in ter- 
minal spikes. 
Srecizs. 1. C. lutetiana, B canadensis. 2. alpina? This 
coes not well agree with the Buropea pekas. 
tittt Flowers incomplete, 
28, LEMNA. L, ‘(Duck-weed.) 7 
Calix of one entire leaf, Stamens alternately 
developed, seated upon the ovarium at its base; —_ 
_ style cylindric, sti 4 
he" = 9 stigma funnel for Boas 
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