BIDYNAMTA. ANGIOSPERMIA. 45 



431. BUCHNERA. jL. 



Calix 5-toothed. Tube of the corolla slender, 

 border 5-cIeft, nearly equal; lobes cordate* 

 Capsule 2-celIed. 



Leaves opposite; flowers spiked or corymbose, telTninal. 



Allied to Eriniis. 



Species. 1. B, americana. Flowers i^reyish-blue. 

 Very common in the western parts of the state of Nev/ 

 York, Pennsylvania, &.c. 



A genus of about 13 species, whereof 2 are indigenous 

 to tropical America, 5 to the Cape of Good Hope, 4 to 

 India and 1 to Arabia Felix. 



432. ANTIRRHINUM. L. (Toadflax, Snap- 



dragon, &c.) 

 Calix 5-parted; the lower segments remote. 

 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. Gartner. 



Herbaceous, or very rarely shrubby; leaves alternate, 

 opposite or verticillate. entire, angular, oblong or narrow; 

 fl^owers solitary and axillary or spiked, furnished with the 

 rudiments of a fifth stamen scarcely conspicuous, as in 2 

 or 3 other proximate genera. 



Species. 1. A. Elatine. Valves of the capsule entire. 

 2. Linaria. Much too abundantly naturalized through- 

 out the middle states, but not indigenous. 3. ca7iade7ise. 

 Chiefly near the margins of sandy swamps and ponds. 4? 

 tenellum. Ph. Leaves linear, opposite; flowers axillary, 

 calix campanulate; stem sim.ple, annual. — Is this plant in- 

 deed of this genus? Can it possibly be a bad specimen 

 o( ColUnsia? 5. Ovontium. Very doubtful. 



A genus of more than 70 species, almost exclusively in- 

 digenous to the south of Europe and Barbary. 



433. ^COLLINSIA. 



Calix 5-cleft. Corolla bilabiate, orifice clos- 

 ed: upper lip bifid; the lower trifid, intermediate 

 segment carinateiy saccate and closed over the 



