Rydberg: Studies on the Rocky Mountain Flora 279 



the base. In this respect they resemble P. Newberryi ; but the 



i 



fruit is much smaller and not flattened on the sides. P. vitulifera 

 differs from the following in the form of the leaves and the curved 

 pedicels. It grows in dry places at an altitude of about 2500 m. 

 Colorado : Idaho Springs, 1895, R* ^- Rydberg (type)] Middle 

 Park, 1 86 1, C. C. Parry, 101. 



* Physaria floribunda sp. nov. 



Densely tufted perennial with thick tap-root. Flowering stems 

 very numerous, ascending or almost erect, 1-2.5 dm. high: basal 

 leaves less crowded and more erect than in the preceding, oblan- 

 ceolate or spatulate, sinuately toothed, acute, 5—10 cm. long : 

 stem-leaves oblanceolate, entire, about 3 cm. long: sepals about 

 5 mm. long, linear-lanceolate : petals bright yellow, 8-9 mm. 

 long, oblanceolate with broad claws : fruit obtuse or slightly cordate 

 at the base, deeply divided above : cells much inflated, about 8 

 mm. in diameter, almost globular : style 6 mm. long. 



In the size and form of the fruit, this species is intermediate 



between the preceding and P. didymocarpa ; but it is taller than 



either. Sometimes the leaves are deeper sinuate, and then become 



slightly fiddleform ; but the terminal lobe is sinuately toothed 



and acutish. 



y 



which is less cordate at the base, and the longer, more acute 

 leaves. It grows in loose sandy soil in mountain valleys at an 

 altitude of 2000-2700 m. 



Colorado: Sangre de Christo Creek, 1900, Rydberg & 

 Vreeland, 6133 (type) and 6136 ; Hills about Golden, 1892, Cran- 

 dall, 33. 



i/ Physaria acutifolia sp. nov. 



A small tufted perennial with a deep rather slender tap-root. 

 Basal leaves numerous, 1.5-2.5 cm. long, oblanceolate or obovate, 

 acute, entire or slightly wavy, very finely stellate: stem-leaves 

 rather few, oblanceolate : flowering stems 4-6 cm. long, ascending 

 or depressed : fruit small, obtuse or slightly cordate at the base, 

 deeply divided above : cells inflated, almost spherical, 4-6 mm. in 

 diameter : style about 5 mm. long. 



This species differs from P. didymocarpa in the smaller size, in 

 the acute leaves, and the smaller fruit, which is more deeply divided 

 above and less so below. In general habit it resembles more P. 



Geyeri, from which it differs in the turgid more spherical cells. It 

 grows in the mountains, reaching an altitude of 3000 m. 



