G2 BOTANY. 



1874, I had regarded this as an unusual form of A. hirsuta. Twin Lakes, 

 Colorado (650 ) 



Arabis Drummondii, Gray. — South Park, Colorado. (655.) 



Arabis Holbcellii, Hornem. — Common and variable. Colorado and 

 Nevada.. 



Cardamine cordifolia, Gray. — 1-2°. Generally erect, from a fibrous 

 root, which not unfrequently is in the water ; leaves all petioled, cordate in 

 outline, irregularly repand-dentate or sinuate, sparingly ciliate ; siliques 

 erect, twice as long as the pedicels. Common in Colorado at 10,000 feet 

 altitude, in swamps and mountain streams. (608, 609, 610.) 



Vesicaria Ludoviciana, DC. — Hoar)' throughout, with a stellate 

 pubescence, erect, 6-10' high, usually branching; root-leaves spatulate ; 

 stem-leaves linear to linear-lanceolate, all obtuse ; flowers yellow ; petals 

 obovate, one-half longer than the sepals; pods oval, somewhat inflated, 

 rather shorter than the style; pedicels 6-9" long. Colorado. (641.) 



Vesicaria Montana, Gray. — Colorado. (647.) By some oversight, I 

 transposed the labels of these two species in distribution of the collection 

 of 1873. 



Physaria didymooarpa, Gray. — Alpine and sub-alpine in Colorado. 

 (642, 648.) The Expedition has it also from Nevada and Utah. 



Draba alpina, L. — A very attractive little perennial found in Colorado 

 at 10,000 to 13,500 feet altitude; its favorite habitat being above timber 

 line. (646.) 



Draba aurea, Vahl. — Pubescent, erect; stem usually quite leafy; leaves 

 lanceolate, acute, entire or sub-entire ; siliques lanceolate, acute, nearly 

 twice- as long as the pedicels, hairy and more or less twisted ; style i" long; 

 petals yellow. A very variable species, of extended range. The Expedi- 

 tion has it from Colorado, New Mexico (Loew 633 and 634); and from 

 the higher mountains of Arizona, the var. stylosa of Gray (1111). 



Draba streptocarpa, Gray. — Alpine in Colorado, along with aurea. 

 My specimens furnish a singular example of transposition of characters 

 usually reliable in distinguishing between these species ; i. e., aurea and 

 streptocarpa. The specimens which have the fruit most characteristic of 

 streptocarpa are in other respects most like (generally including length of 



