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A revision of the genus Mitella etc. 3gJ 



Wyoming to southwestern Colorado; ranging east and west from Laramie, 

 Wyoming, to Salt Lake, Utah. 



This variety is the southward extension of the species, the ranges of 

 I } the two overlapping In southeastern and eastern Idaho. It is very variable 



with the age and size of the individual plants and with the habitat. Old 

 sturdy individuals produce larger leaves and flowers than young plants, 

 and those growing in shady situations have very large thin leaves as well 

 as tall flowering stems. The petals are extremely variable, ranging from 

 deeply 3-parled to those that are unequally 3 — 2-parted and entire. We 

 regard M. ste^iopetala var. Parryi Piper as nothing but a young or small 

 individual of var. stenopetala. 



3. Mitella triflda Graham, Edinb. New Phil. Journ. 185. 1829. 

 Oxomelis varians Rafin. Fl. Tell. 2. 75. 1836. — MiteUoides Hookeri Meisn. 

 PI. Vase. Gen, 100. 1838. — LUhophragma nudicaulis Nutt. Mss. in T. 



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trifid 



et G. Fl. N. Am. 1. 587. 1840. —MiteUoides trifida Walp 

 1843. — Mitella anomala Piper, Erythea 7. 162. 1899. 

 (Graham) Rydb. N. Am. Fl. 22. 2. 95. 1906. — Oxomelis pad fi 

 N. Am Fl. 22. 2. 95, 1905. — Rhizome ascending, becoming quite thick 

 in old plants; flowering stems 1 -several, slender, erect, 1.5 — 4.5 dm. high, 

 glandular-pubescent, bearing 1 or 2 bracts and very rarely a single leaf 

 near the base; leaves cordate to orbicular and reniform, faintly crenate 

 or more or less deeply crenate-lobed, pubescent with scattered stiff white 

 hairs above, nearly glabrous below, 2—8 cm. long, 2—7 cm. wide; petioles 

 prominently retrose-hairy especially above the middle; racemes 7—20 flow- 

 ered, 3— 12 cm. long, puberulent; bracts lanceolate, lacerate-toothed ; pedicels 

 very short; flowers 2—4 mm. broad in anthesis, 3—5 mm. long; axis cam- 

 panulate; sepals oblong, whitish to violet-tinged, 1 — 1.5 mm. long, midvein 

 usually branched; petals cuneate and trifid, 2— 2.6 mm. long, white or 

 violet-tinged; anthers ovate-oblong, filament very short; ovary half united 

 with the axis, styles thick, glandular-puberulent, stigmas capitate; capsule 

 depressed-ovoid, dehiscing broadly cup-shaped; seeds numerous, black and 

 shiny. 



A polymorphous species, widely distributed in the Rocky, Selkirk, 

 Cascade and Olympic Mountains. In the Rocky Mountains it extends, with 

 the varieties and forms included^ from southern Montana to about latitude 

 60 degrees north; in the Cascades from Northern California to about lati- 



; tude 51" N. 



The following variety seems fairly wellmarked: 



Var. violacea (Rydb.) Rosend. Englers Bot. Jahrb. 37. 2. 83. 1905. 

 M. violacea Rydb. Bull. Torr. Bot. Club. 24. 248. 1897. — Oxomelis 

 ^.._ w^ „ „ . „. „_ ^ „.. ^g^g — Petals oblanceolale, slightly 



iolacea 



exceeding the sepals, entire or slightly and unequally toothed, sepals and 



petals often violet tinged. 



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