1245 



PENTSTEMON* triphyllum. 

 Three-leaved Pentstemon. 



DIDYNAMIA ANGIOSPERMIA. 



Nat. ord. Scrophularine^. 

 PENTSTEMON. — Supril, vol. 13. /o^. 1121. 



P. triphyllmn ; herbaceum, humile, foliis ternis quaternisve glabris incisis : 

 inferioribiis oblongis, floralibus integerrimis, pedunculis bi-trifloris calyci- 

 busque arachnoideis, corollae laciniis oblongis obtusis : labii inferioris 

 Eequalibus. 

 P. triphyllum. Douglas. 



Caulis teres, ramosns, pedalis sesquipedalisve, coloratus. Folia 3-4- 

 natim verticillata, obtusti incisa, inferiora oblonga, superiora lanceolata, 

 snprema (Jloralia) lineari-lanceolata, integerrima. Flores parce paniculati, 

 pedunculis 2-3-Jioris, arachnoideis, Calycis lacinice Of atce, acutce, arach- 

 noidcfB. Corolla subventricosa, pallide rosea, venosa, lahio superiore emar- 

 ginato: laciniis obtusis ; inferiore triloba, laciniis oblongis, obtusis, cequalibus. 

 Filamenta superiora basi dilatata ; rudimentum Jiliforme , harbatum. Antherse 

 albce, glabrae. — Douglas. 



According to Mr. Douglas, by whom this was detected, 

 it is a common plant, on decomposed dry granite, or schist 

 rocks, on the Blue Mountains of North-west America, in 

 the district watered by the river Columbia ; it is also 

 found on the mountains to the southward in Northern 

 California. It was introduced by the Horticultural Society 

 in 1827, and flowered in August 1828, when our drawing 

 was made. 



The verticillate disposition of the leaves is not repre- 

 sented in our plate, in which the upper part of a very 

 vigorous plant is shewn. They are characteristic of the 



* So called from vivn, five, and a-rHii^cc, a stamen, in allusion to the 

 presence of a fifth stamen ; an unusual occurrence in the order to which 

 this genus belongs. 



