322 University of California Publications in Botany [VOL. 9 



52. SCEOPHULAEIACEAE (FiawoRT FAMILY) 



Stamens 5, one being sterile. 



Sterile stamen elongated 1. Pentstemon 



Sterile stamen rudimentary and gland-like 2. Collinsia 



Stamens less than 5. 



Stamens 2 3. Veronica 



Stamens 4. 



Corolla closed in the throat by a palate; capsule opening by pores .... 



4. Antirrhinum 



Corolla not closed in the throat by a palate; capsule valvate. 



Stamens not included in the upper lip of the corolla; leaves mostly 



opposite 5. Mimulus 



Stamens included in the upper lip of the corolla; leaves mostly alternate. 

 Anther cells equal, parallel, and alike in all 4 stamens ....6. Pedicularis 

 Anther cells unequal or dissimilar, the outer affixed by its middle, the 

 inner pendulous by its upper end and usually smaller. 



Corolla lips very unequal, the lower not saccate 7. Castilleja 



Corolla lips subequal, the lower saccate 8. Orthocarpus 



1. PENTSTEMON 



Anther cells dehiscent their whole length or nearly so (section Eupentstenwn) . 



Anthers comose with long hairs (P. Mensiesii) 



Leaves nearly or quite entire; flowers purple 1. P. Menziesii var. Davidsonii 



Leaves serrate; flowers reddish 2. P. Newberryi 



Anthers not comose but glabrous (except occasionally a few hairs in P. 

 glaber). 



Flowers white or yellowish 3. P. deustus 



Flowers purplish. 



Flowers verticillate; sterile filament hairy 4. P. procerus 



Flowers paniculate; sterile filament naked. 



Inflorescences and calyces glandular 5. P. heterodoxus 



Inflorescences and calyces glabrous 6. P. glaber 



Anther cells confluent at apex and dehiscing only to the middle, the anther 

 in anthesis horseshoe-shaped (section Saccanthera) . 



Sterile filament slightly hairy 7. P. gracilentus 



Sterile filament glabrous. 



Inflorescence and calyx glandular or viscid 8. P. Boezli 



Inflorescence and calyx not glandular or viscid 9. P. azureus 



1. Pentstemon Menziesii var. Davidsonii (Greene) Piper, Contr. 

 Nat. Herb., vol. 11, p. 499. 1906. 



P. Davidsonii Greene, Pitt., vol. 2, p. 241. 1892. 



Type locality. ' ' On Mt. Conness, at an altitude of 12,300 feet. ' ' 

 Yosemite region. 



Range. Southern Sierra Nevada northward through the Sierra 

 and Cascades to Washington. 



Zone. Arctic-alpine, rarely in the Hudsonian. 



Specimens examined. Mt. Rose, 10-10,800 feet, Kennedy 1273; 

 same locality, 10,800 feet, Kennedy 1182; same locality, 9,650 feet, 

 Heller 9898; Mt. Tallac, Tahoe, 9,500 feet, Smiley 231; Mono Pass, 

 rocks at summit, 9-12,000 feet, Brewer 1721; same locality, exposed 

 rocky summit of pass, 10,700 feet, R. A. Ware 2609c; Mt. Gibbs, 



