DIDYXAMIA. ANGIOSPERMIA. 



t Upper Up of the corolla compressed; the loiuer plaited. 

 'Species. 1, P. Ixvigatxim. 2. pubescens. Leaves \n 

 both these species repandiy serniUite, and with the ori- 

 fice ofihe lower lip pubescent. 3. *gracile. Slem smooth 

 and slender; leuvcs smooth, linear, acute, subumplexi- 

 caule, sharply serrulate; panicle s-mple, few-flowered; 

 sterile filament longitudinally bearded; corolla internally 

 smooth, segments of the calix linear-ohlong-. Hae. From 

 the Arikarees to Foit Mandan, in depressed soils. Flow- 

 ering in June. Allied to P. pubescens, but perfectly dis- 

 tinct. Flowers the smallest of the g"enus, pale purple. 

 Radical leaves lanccolate-ovate, entire; stem leaves 

 opaque, and pungently serrulate, remote. 



f Corolla s7/bcampanulaie, border almost-eqxtally 5-lobed. 



4' * cristatcm. Fras. Catal. 1813. P. erianthera. Ph. 2. 

 p. 7o7- Obs. Pubescent. Stem 6 to 8 indies. Radical 

 leaves lanceolate and denticulate; cauline sessile, linear- 

 oblong-, sublanceolate. Pedicells axillsry and teiminal, 

 1 to 3-flowered, very short. Calix subhirsute, segments 

 linear-lanceolate, acuminate. Corolla large and violace- 

 ous, ventricose; border 5-lobed, spreading, orifice of the 

 lower lip and the whole upper surface of the subexserted 

 sterile filament very conspicuously and cristately beard- 

 ed. Hab. On arid denudated argillaceous hills from the 

 confluence of Teeton river and the Missouri to the Moun- 

 tains. 5. frxitescens. 



6. *erianthera. Fras. Catal. P. glabra. Ph. 2. p. 738. 

 Bet. Magaz. — Very smooth; leaves sessile, ovate-lanceo- 

 iate, entire, margin partly undulated; peduncles many- 

 flowered, secund; segments of the calix rounded-oval, 

 acuminate; sterile filament slightly bearded under the re- 

 cuse point; anthers pubescent. Hab. In arid soils near 

 the confluence of Shian river. Flowering in June. Flow- 

 ers purple, by cultivation very numerous, as in the figure 

 in Curtis's Magazine. The pubescent anthers distinguish 

 this from every other known species, but it never amounts 

 to the tomentum of Chelone. 



7. * carulevm. Smooth and glaucous; radical leaves 

 sublinear, cauline sublanceolate-linear, all entire and ses- 

 sile, margin minutely pubescent; sterile filament sliort and 

 bearded above; leaves of the cnllx lanceolate, acute; pe- 

 duncles many-flowered; Cv)rolla subcampanulate, azure 

 blue. Hab. On the plains of the Missouri, near Fort 

 Mandan and the Indian towns. Rare. P. angnstifoUinn. 

 Fras. Calal. and Ph. 2. p. 738, but as P. gracUe is also 

 equallv narrow-leaved, and the beautiful and peculiar co- 

 k)i' of' the flower so characteristic, 1 could not refrain 



