DIDYNAMIA. ANGIOSPERMIA- as 
431. BUCHNERA. L. i 
Calix 5-toothed.. Tube of the corolla slender, 
border 5-cleft, nearly equal; lobes cordate. 
Capsule 2-celled.. | 
Leaves opposite; flowers spiked or corymbose, terminal. 
Allied to Erinus. 
Species. t B: americana. Flowers greyish-blue. 
Very common in the western parts of the state of New 
York, Pennsylvania, &c. 
_A genus of about 13 species, whereof 2 are indigenous 
to tropical America, 5 to the Cape of Good Hope, 4% 
India and 1to Arabia Felix. 
432. ANTIRRHINUM. Z. Sapericne B Snap- 
dragon, &c.). 
Cali: 5-parted; the lower atphienti rélidts. 
Corolla calcarate, ringent, orifice closed by the 
prominent palate. Capsule ovate, 2-celled, 2- 
valved,. bursting at the summit with 3 to-5 re- 
‘flected dentures, a stapediform styliferous arch 
remaining betwixt either aperture. G#RTNER. 
Herbaceous, or. very rarely shrubby; leaves alternate, 
opposite or verticillate, entire, angular, or narrow; . 
flowers solitary and- axillary -or spiked, furnished with the 
rudiments of a fifth te scarcely conspicuous, as in 2 
or 3 other proximate genera. 
Specres. 1.A.Elatine. Valves of the capsule entire. 
2. Linaria. Much too abundantly naturalized through- 
out the middle states, but not indigenous. 3. canadense. 
Chiefly near the margins of sandy swamps and ponds. 4? 
" fenellum. Pu. Leaves linear, opposite; flowers axillary, 
calix campanulate; stem simple, annual.—Is this plant in- 
- deed of this genus? Can ——— 
of Collinsia? 5. Orontium. Very doubtful 
A genus of more than 70 species, almost exclusively in- 
digenous to the south of, Europe and. Barbary. 
438, *COLLINSIA. | : * eae 
Calix 5-cleft. Corolla bilabiate, orifice ‘Clo! 
ed: upper lip bifid; the lower trifid, intermedia 
— carioately pene ste clesed over 
as 
