DIDYNAMIA. ANGIOSPERMIA^ 53 



from adopting- It in preference to that Avhicli I had for- 

 merly g-iven, previous to my becoming;- acquainted with 

 the flower, which Mr. Shepherd obtained from a plant 

 that I had presented to the Botanic g-arden of Liverpool. 

 The plant somewhat resembles P. bnrbaivm of Mexico 

 (Chelone bavbata) but the flower is tubular-campanulate, 

 with an almost equally 5-clefr, border, and of a beautiful 

 azure blue, without the smallest tinge of violet; a color 

 so prevalent in all the other species. 



8. * albiilum. Stem very low; leaves ovate-lanceolate; 

 subserralate, smooth and sessile; flowers partly fas- 

 ciculated, axillary and terminal; stevile filament slen- 

 derly and interruptedly bearded; corolla internally smooth 

 and partly tubular, border almost equally 5-cleft, spread- 

 ing-; leaves of the calix linear-lanceolate, pubescent. Hab. 

 On the plains of the Misso-jri, common, from the conflu- 

 ence of tlie river Platte to the Mountains. P. teretijlora. 

 Fras. Catal. 1813. The humblest species of the g-enus, 

 rarely exceedincj 6 or 8 inches in heig-ht; stem somewhat 

 angular. Leaves approximating. Flowers usually white. 



9. * grnnd'Jionrm. Fras. Catal. 1813. Very smooth and 

 glaucous; leives entire; radical suboval, canline amplexi- 

 cavde, roundish-oval, wit'n an abrupt point; flowers large, 

 mostly solitary and axillary; corolla campanulate, border 

 5-lobed, spreading; sterile fllament partly pubescent at the 

 summit. P. Bradburii. Vn. Hab. On the plains of the 

 Missouri, common, from the onfluence of the river 



^Platte to the Mountains; also near the Prairie du Chien, 

 'Missssippi. A splendid and beautiful species, about 3 

 feet high, flowers variously tinged, as large as those of 

 Diifitalis purpurea which they not unaptly resemble. 



A North American genus and probably an extensive 

 one. 



440. iMARTYNIA. L. 



Calix 5-cleft. Corolla rin.^ent. Capsule lii?- 

 neons, corticate, 4-celle(l, 2-va!ved, eacii of the 

 valves terminating in a hooked rostrinn. 



Annual plants with opposite or alternate leaves; flowers 

 racemose axillary or terminal. 



Specifs. 1. M. proboscuka. Common around Lew- 

 istown in Delaware, also on the banks of the Ohio and Mis- 

 sissippi. The whole plant is remarkably viscid, the singu-^ 

 lar form of its large fruit has obtained it the name c f 

 Cuokold's-Uorns. 



E .2 



