238 



PITTONIA. 



Tv-liich the Gerardia fndicosa of Parsh is, pliytographically 

 speaking, the earliest type, I shall give a list of names of 

 what have been separated from it by some authors, and 

 merged in it by others. 



1. Penfsfemon Scouleri (Dough, under Chelone), Lindl. 

 Bot. Keg. XV. t. 1277 (1829). 



2. Pentstemon crassifoUus, Lindl. 1. c. xxiv. t. 16 (1838). 



3. Pentstemon 2Ienziesn, Hook. Fl. ii. 98 (1840, or earlier). 



4. Pentstemon Douglasii, Hook. 1. c. , 



5. Pentstemon Lewmi, Benth.; DC. Prodr. x. 321 (1846). 



6. Pentstemon Lyalli, Gray, Syn. Fl. Suppl. 440 (1886). 



7. Pentstemon Newherryi, Gray, Pac. K. Eep. vi. 82. t. 14 

 (1857). ^ ' ^' 1 



« 



8. Pentstemon Sonomerm's, Greene, Pittonia, ii. 218 (1891). 



Over and above these, there exist in some of our herbaria 

 two or three plants of the group, manifestly not referable to 

 any of them, but still unnamed and unpublished. Now 

 whether these eight names represent four or five species or a 

 dozen, is a question which, at the rate of progress commonly 

 made in such work, it may take another hundred years to 

 solve. The plants occupy range of from tAvelve to fifteen 

 hundred miles north and south, and, at least in the latitude 

 of the northern U. S. boundary, ranging half that distance 

 east and west. Some forms are found in the moist climate 

 of the Pacific shores; others inhabit most arid districts of 

 the remote interior. Various others are confined to alpine 

 and subalpine heights of different mountain ranges. No man 

 need attempt to either segregate or condjine the species who 

 has not a practical knowledge of the geographical and cliiua- 



