DIDTNAMIA. ANGnOSPERMIA. 45 



4S1. BUCHNERA. L. 



Calix o-tootbed. Tube of the coj^olla slender, 

 border 5-cleft, nearly equal; lobes cordate. 

 Capsule 2 -celled. 



Leaves opposite; flowers spiked or corymbose, terminal. 

 Allied to Erinus. 



Species. 1. B. ainencana. 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 to 

 India and 1 to Arabia. Felix. 



432. ANTIRRHINUM. L. (Toadflax, Snap- 



dragon, &c.) 



Calix 5-parted,* the lower segments remotco 

 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; 

 flowers solitary and axillary or spiked, furnished with the 

 rodiments of a iifth stamen scarcely conspicuous, as in 2 

 or 3 other proximate genera. 



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

 % 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? 

 tenellnm. Ph. Leaves linear, op'posite; flowers axillary, 

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

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

 of CoUinsia? 5. Orontium. 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 carinately saccate and closed over the 



