

n - ■ 



380 



G. 0. RosendahJ. 



site or more or less petioled and tending to become alternate, and with 

 distinct stipules 2—3 mm. long. The following forms are among the most 

 noteworthy: 



Forma oppositifolia (Rydb.), — M. oppositifolia Rydb. N. Am. Fl. 

 22; 2. 91. 1905. —A plant with petioled stem leaves, said also to differ 

 in sepals and petals from the species. 



Collected in Massachusetts by A. S. Kinney. 



Forma triphylla. A form bearing two nearly opposite short-petioled 

 leaves and a smaller sessile one higher up on the stem. 



Collected at Milaca, Minnesota, 1892, by E. P. Sheldon (2789). 



2. Mitella stauropetala Piper, Erythea Vol. 7. 161. 1899. — Oxo- 



melts stauropetala (Piper) Rydb. N. Am. Fl. 22. 2. 95. 1905. — Rhizomes 

 creeping, stolon-like, with conspicuous scale-leaves; flowering stems 1 — 6, 

 erect, slender, with few scarious fimbriate bracts, thinly pubescent below, 

 glandular-puberulent above, 3—5 dm. high; leaves cordate, orbicular, or 

 reniform, mostly obscurely 5 — 7-lobed, more or less distinctly crenate, 

 thinly hirsute with white or reddish hairs on both sides, 3—9 cm. long, 

 3 — 8 cm. broad; petioles stoutish, retrorsely-hirsute especially toward the 

 upper end, 5 — 15 cm. long; racemes secund, 10 — 35-flowered, 6 — 20 cm 

 long, glandular-puberulent; bracts lanceolate, variously toothed or lacerate; 

 pedicels about 1 mm. long; flowers white or violet-tinged, 6 — 7 mm. broad, 

 in anthesis, 5— 6 mm. long; axis turbinate or campanulate; sepals oblong 

 to obovate, nearly erect, about 2 mm. long, mid-vein unbranched ; petals 

 white, slender, 3-parted above the middle into narrow filiform divisions, 

 spreading, about 4 mm. long; anthers large, oblong, nearly sessile; ovary 

 fully half united with the axis, styles thick, glandular-puberulent, stigmas 

 capitate; capsule depressed-ovoid, dehiscing cup-shaped; seeds numerous, 

 black and shiny. 



Common in the wooded regions of northern Idaho. Extends into 

 northwestern Montana, northeastern Oregon, and southeastward to southern 

 Idaho, passing into the following variety in Utah, Wyoming and Colorado: 



Var. stenopetala (Piper) n. comb. — if. stenopetala Piper, Erythea 

 Vol. 7. 161. 1899. — Oxomelis stenopetala (Piper) Rydb. N. Am. Fl. 22. 

 2. 96. 1905. — M. stenopetala var, Parryi Piper, Erythea 7. 162. 1899. 

 Oxomelis Parryi (Piper) Rydb. N. Am. Fl. 22. 2. 96. 1905. — More slender 

 than the species, stems sparingly pubescent and puberulent; leaves sometimes 

 more conspicuously crenately-lobed (not in the type), nearly glabrous on 

 both sides; petioles with scattered retrorse hairs above; racemes 10 25- 

 flowered, 5 — 10 cm. long; flowers very variable in size but smaller than 

 in the species; petals 3-parted above the middle into narrow divisions or 

 entire. 



In moist springy places from Yellowstone National Park and northern 



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