ROSE FAMILY I3I 



this species. It grows in the pine forests at middle altitudes, 

 as at Yosemite Valley and Hog Ranch. 



3. H. unguiculata Rydb. Stems numerous, 6 to 15 in. high, 

 leafy to the top. Leaves 2 to 5 in. long, grayish with scat- 

 tered hairs; leaflets numerous and crowded (30 or more), % 

 in. or less long, divided to the base into linear segments. 

 Flowers white, the calyx commonly purplish. (Ivesia ungui- 

 culata Gray.) — Remarkable for its leafy stem and soft, crowd- 

 ed leaflets. First described from specimens gathered at West- 

 falls Meadows by H. N. Bolander (alt. 8000 ft.) but now 

 known to range south to Fresno Co. 



4. H. gordonii Hook. Flowering stems 2 to 8 in. high, 

 nearly leafless. Leaves basal, ^4 to 3 in. long, scarcely peti- 

 oled, green or yellowish green, obscurely hairy; leaflets 

 numerous, about ^ to ^ *&• l° n £> cleft nearly to base into 

 narrow divisions, closely placed but not entirely masking the 

 leaf-stalk. Flowers yellow, in slightly branched or more 

 head-like terminal clusters. (Ivesia gordonii T. & G.) 



The narrow leaves of this plant form dense tufts resem- 

 bling clumps of certain mosses. It grows only near timber- 

 line and many forms occur. One, with conspicuous petals 

 exceeding the calyx, is the var. megalopetala Rydb. Another, 

 with very dwarf habit and bristle-tipped leaves, has been 

 called H. pygmaea Rydb. A third form, likewise dwarfed, with 

 leaves only 1 in. long, the minute segments densely crowded 

 (not bristle-tipped) is H. lycopodioides Rydb.; it comes from 

 Mt. Hoffmann and Mt. Dana. Such forms, however, do not 

 serve well for species. 



5. H. muirii Rydb. Stems erect, slender, 1 to 5 in. high. 

 Leaves 1 to 1^4 in. long, terete, white or pale and silky with 

 a dense soft hairiness; leaflets very numerous, minute, com- 

 pletely covering the central stalk nearly to the base. Flowers 

 in white-hairy heads, the minute yellow petals linear. (Poten- 

 tilla muirii Greene.) 



This is a most peculiar Alpine plant, with its dense, basal 

 tuft of worm-like leaves, and short, nearly naked flowering 

 stalks each capped by a round head of minute flowers. It in- 

 habits gravelly slopes high up on Mt. Hoffmann, where it was 

 first found by John Muir, in whose honor it was named. 



9. STELLARIOPSIS. 

 1. S. santolinoides Greene. Stems slender, erect, ^ to 1 ft. 

 high, nearly naked, widely branched above. Leaves cylin- 

 dric, 1 to 3 or 4 in. long, gray and silky with a dense pu- 



