52 DIDYNAMIA. ANGIOSPERMIA. 



I Upper Up of the corolla compressed; the loxver plaited. 

 Species. 1. P. Icevigatum. 2. pubescens. Leaves in 

 both these species repandly serrulate, and with the ori- 

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

 and slender; leaves smooth, linear, acute, suh;.mplexi- 

 caule, sharply serrulate; panicle simple, few-flowered; 

 sterile filament longitudinally bearded; corolla internally 

 snaooth, segments of" the calix linear-oblong-. Hab. From 

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

 ering in June. Allied to P. puhescenSf but perfectly dis- 

 tinct. Flowers the smallest of the g-en\is, pale purple. 

 Radical leaves lanceolate-ovate, entire; stem leaves 

 opaque, and pungently serrulate, remote. 



f Corolla subcaivpanulate, border almost-eqiially 5-lobed. 



4> * cristatam. Fras. Catal. 1813. P. eriaiithera. Ph. 2. 

 p. 7o7- Obs. Pubescent. Stem 6 to 8 inches. Iladicat 

 leaves lanceolate and denticulate; cauline sessile, linear- 

 oblong, sublanceolate. Pedicells axillary and terminal, 

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

 linear-lanceolate, acuminate. Corolla large and violace- 

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

 lower lip and the wiiole upper surface of the subexseiled 

 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. frutescens. 



6. • evianthera. Fras. Catal, P. glabra. Ph. 2. p. 738. 

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

 late, entire, margin partly undulated; peduncles many- 

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

 acuminate; sterile filament slightly bearded under the re- 

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

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

 ers pinple, by cultivation very numerous, as in tiie figure 

 inCurtis's Magazine. The pubescent anthers distinguish 

 this from every other known species, but it never amounts 

 to the tomentum of Chelone. 



7. * cartdeum. Smooth and glaucous; radical leaves 

 sublinear, cauline sublanccolate-linear, all entireand ses- 



■ sile, margin minutely pubescent; sterile filament short and 

 bearded above; leaves of tiie calix lanceolate, acute; pe- 

 duncles many-flowered; corolla subcampannlate, azure 

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

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

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

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

 lor of' the flower so characteristic, I could not retrain 



