DIDYXAMIA. ANGIOSPERMIA. 51 



lower lip prominent. Stigma tiiick and bifid. 

 Capsule 2-celIed, nmny-see.icd. Seeds minute. 



iSIostly herbaceous plaints, with prominently quadi'angu- 

 lar stems and opposite leaver; pedaacles solitary and ax- 

 illary, l-flowered, destitute of bractes; colour of the flow- 

 ers blue or yellow. 



Species. I. M. riiiifeiis, 2- alatiis. Nearly allied tQ 

 the preceding-. 3. luteus. 4. Lewisii. Pii. 



A small genus of 6 species, partly indigenous to both 

 North and South America. 



438. CHELONE. L. 



Calix S-parted, tribracteate. Corolla rin- 

 gent, ventj'icose. Sterile Jilament shorter than 

 the rest; anthers Ian ugi nous. Capsule 2-celled, 

 2-vaIved. Seeds membranaceously margined. 



Herbaceous plants with opposite leaves; flowers snbim- 

 bricately spiked, terminal; lower lip of the corolla inter- 

 nally bearded; capsule oval. ( C. barbata is a Pentsternoii, 

 and therefore an exception to the artificial character.) 



Species. 1. C. glabra. Leaves lanceolate-oblong, 

 acuminate, serrate, subsessUe, smooth. /3 * lanceolata. 

 Leaves lanceolate, conspicuously acuminate, serrate, ses- 

 sile, under side pubescent; bractes scarcely dilated; seg- 

 ments of the calix oblong. Probably a distinct species. 

 2. obliqua. 3. Lyoni. v. v. Near Wilmington, (N. Carol.) 



A North AmeriC.m genus. 



459. PENTSTEMON. Z. 



Calix 5-leaved. Corolla bilabiate, ventricose'. 

 The Jifth sterile filament longer tlian the rest 

 and bearded on the upper side. Anthers smooth. 

 Capsule ovate, 2-ceIled, 2-vaIved. Seeds nume- 

 rous, angidar. 



Herbaceous and perennial plants, rarely shrubby or 

 suffruticose; leaves opposite, entire, flowers paniculate, 

 purple, rarely scarlet, or blue; corolla usually bilabiate, 

 oblong anil tubular; the upper lip shorter, 2-lobed, and co- 

 arctate; orifice usually pub\?hcent; in several other species, 

 however, the corolla appears nearly campanulate and with 

 the border almost equally 5-lobed, in these the Sterile 

 fHament is less conspicuous. 



