35 



var. acuminata.^ This latter species prefers damper ground, and 

 affords food for certain Lepidopterous larvae. Leaving the open 

 ground, we may now ascend to about 8,200 feet, where the pine 

 timber begins at the base of the Sangre de Cristo Range. We at 

 once meet with a different form, which is rather hke iniegra, but 

 taller and more slender, and otherwise peculiar. Faihng to fit it 

 with any known species, I will call it for the present C. hitegra 

 var. gracilisA This is the first sign of increase of altitude, which, 

 added to the effect of the timber, with moisture and shade, has 

 produced this taller form with deeply incised bracts. 



Let us now follow up Brush Creek, one of the mountain 

 streams. Up to over 10,000 feet we meet with nothing new, 

 until, on a dry aspen-covered slope, appears a third scarlet- 

 bracted form, Castilleia linaricefolia, Benth. C. iittegra var. 

 grows at the same place, and can be distinguished from it at a 

 glance. We will call this C. linaria^folia form (a.) coccinca, as the 

 species is not always of this color. So we go on higher, and at 

 about 11,000 feet is another stranger — when first I saw it, I did 

 not even guess what it might be. But an examination in the 

 hand, and a comparison with the C. linariwfolia I had gathered 

 lower down, soon settled the matter — it was a {oxm\oi li7iarioe' 

 folia with bright crimson 5 -parted bracts. How strange, to find 

 a species abundantly at one altitude, and uniformly scarlet, and 

 to ascend perhaps 800 feet in the same gulch, and find it again 

 but crimson ! It was one of the most striking things in variation 



I had ever seen, but shortly it was to be outdone In the same genus. 

 Close to where I had found the crimson linarioefolia, I came 

 across a little family of Castilleias growing on a space of about 

 two feet square — C. pallida forms, evidently. There were three 

 varieties or forms, all intergrading beautifully at that very spot; 



* C, pallida acuminata (Pursli), BrItt.=C. pallida septoitrionalis. Gray ; 



Coult. Man. p, 284. 



\ Castilleia Integra oracilis : About 2 feet high, tomentose puberulent : 

 I, eaves rather inclined to be scabrous. Stem slender, erect, strong, somewhat 

 tinged with purple. Leaves narrow, lanceolate, conspicuously 3-nerved, entire : 

 lower cauline 58 mill, lonj and 9^ broad. Bracts tomentose, 3-parted, the divisions 

 (the middle one largest) bright scarlet. Calyx about equally cleft before and behind 

 or rather more before. Galea exerted, shorter than tube of corolla. Lip tricallous. 

 Described from fresh specimens. Willow Creek, Custer Co., Colo., Aug. 3, 1889. 



:|: C linayiaifolia f, rosea f, nov. 



