VOL. IV.] Colorado Plants. 7 



OxALis CORNICULATA L. var STRiCTA. The common form 

 found at Denver is slender, loosely branching upwards, leaves 

 scattered; the alpine variety shows a modification due to 

 environment, and becomes low and almost prostrate, leaves 

 crowded along the short rather stout stems. 



Pachystina Myrsinites Raf. This is described in 

 Coulter's Manual as having green flowers. All that I have 

 seen have purple flowers, 



Mentzkua AI.BICAULIS Dougl. There are two varieties of 

 this common species. One is the widely distributed form with 

 slender stems and linear-lanceolate leaves pinnatifid into 

 narrow, linear lobes. The other which I name var. integrifolia 

 is low with short, stout branches, or in more favorable situations 

 becoming a foot high, leaves ovate-lanceolate or even broadly 

 ovate entire or rarely coarsely and remotely dentate, petals not 

 exceeding the stamens, pubescence somewhat viscid as well as 

 barbed. This grows on the adobe desert and blooms almost as 

 soon as it is up. It branches from near the base, and the leaves 

 seem long and crowded on the short stems; but on the older 

 specimens the stems elongate and the leaves are less crowded. 



Mentzelia muIvTifi^ora Gray. At Grand Junction this 

 variable species was found growing on a slaty hillside. It 

 branched diffusely from the base and above, making a globular 

 plant like a tumble weed. The stems are white, slender and 

 sinuous; leaves small, about an inch long and pinnately parted 

 into narrow, linear divisions; flowers small, not an inch in 

 diameter, yellow. Along the McElmo Creek the plants have 

 lobed leaves from one to three inches long, stems less numerous, 

 stouter and straighter than the preceding, flowers larger. 



Mentzelia nuda Torr. & Gray. This varies in the 

 manner of growth and size of the flowers. The Denver form is 

 loosely branched from near the base upwards, and the flowers 

 are large, from one and one-half to two inches in diameter, 

 distinctly pedunculate. The form from Southwestern Colorado 

 has an erect stem simple up to the inflorescence; the branches 

 are usually short with the almost sessile flowers bunched at the 

 ends; flowers about an inch in diameter. 



