394 PHANEROGAMOUS PLANTS. 



5. PENTSTEMON, VHer. 



1. Pentstemon Scouleri, Dough 



Pentstemon Scouleri, Dougl. in Lindl. Bot. Eeg. t. 1277 ; Benth. in DC. Prodr. 10, 

 p. 320. 



Hab. Banks of the Spipen River, east of the Cascade Mountains. — 

 This rare and handsome species forms small beds of procumbent 

 stems, which throw up erect branches of about a foot in height. The 

 leaves in most of the specimens are entire, but in some cases they are 

 denticulate-serrate. 



2. Pentstemon Gairdneri, Hooh. 



Pentstemon Gairdneri, Hook. Fl. Bor.-Am. 2, p. 49; Benth. in DC. Prodr. 10, 

 p. 321. 



Hab. Banks of the Spipen River, Washington Territory. — Hitherto 

 this plant has been known only from the specimens collected by 

 Douglas more than thirty years ago on the " Blue Mountains ; " prob- 

 ably on the Upper Columbia. These were in fruit with some withered 

 flowers. All of our specimens are in full flower. Sir William Hooker 

 states that the species is remarkable for its alternate leaves and pedi- 

 cels, and so they are most commonly; but in some instances the 

 leaves (which are crowded) are opposite. The pedicels are occasion- 

 ally 2-flowered. The corolla is about three-fourths of an inch long, 

 tubular-campanulate ; the limb somewhat two-lipped, with the lobes 

 rounded. 



3. Pentstemon speciosus, Dougl. 



Pentstemon speciosus, Dougl. in Lindl. Bot. Reg. t, 1270 ; Hook. Fl. Bor-Am. 2, 

 p. 98 ; Benth. in DC. Prodr. 10, p. 322. 



Hab. Sandy alluvions of the Upper Columbia and its tributaries. 



