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A revision of the genus Mitella etc. 379 



a. Stamens opposite the sepals 



(4) Expanded calyx more than 5 mm. across, styles tapering, 



ascending, stigmas entire, 1—3 cauline leaves .... G. 3/. catde^cem 

 (2) Expanded calyx less than 5 mm. across, styles thickened 



upward, stigmas 2-lobed, leaves all basal 



(a) Leaves broadly cordate to reniform, broader than 



long, nearly smooth above, petals with 3—8 divisions 7. M. Brewer i, 



(b) Leaves oval to oval-oblong, longer than broad, pro- 



minently white-hirsute above, petals with 3 — 5 divi- 

 sions 8. ^/. ovalts 



b. Stamens opposite the petals 



(1) Petals greenish-yellow, without glands on the dorsal side, 

 disk covering the ovary, sepals strongly reflexed ... 9. Af. pentandra 



(2) Petals purplish, dotted with conspicuous glands on the 

 dorsal side, disk not covering the ovary, sepals sprea- 

 ding or reflexed only at the tip 

 (a) Stamens inserted on the angular disk, styles slender, 



I stigmas not lobed, scapes few-flowered 4 0, M. panciflora 



\ (b) Stamens inserted at the base of the petals, styles 



I thick and short, stigmas 2— 4-lobed, scapes secundly 



J many-flowered 



I X. Leaves glandular pubescent on both sides and on 



I 



the petioles, petals with .'l — 7 divisions . . . . \\. M. jftponico 



y. Leaves glabrous below and on the petioles, petals 



with 3 divisions 



■J2. M. acnrina. 



^. Mitella diphylla L. Sp. PI. 406. 1753. — Rhizome creeping, more 

 or less branching; flowering stems slender, erect, i.2— 4.5 dm. high, bi- 

 foliate above the middle, pubescent with scattered hairs below the cauline 

 leaves, glandular-puberulent above ; basal leaves cordate, 3— 5-lobed, crenale- 

 dentate, thin, thinly pubescent above, prominently pubescent, especially 

 along the veins beneath, with long, strigose hairs, 3—9 cm. long, 2.5—8 cm 

 » broad; petiole slender prominently retrorse-hairy, 4 — 17 cm. long; cauline 



f leaves 2, opposite, sessile or nearly so, unequal, prominently 3-lobed, middle 



lobe much elongated, <— 7 cm. long; raceme 5 — 20-flowered, 6—20 cm. 

 Jong, glandular-puberulent; bracts minute, broadly triangular; pedicels 

 <— 2 mm. long; flowers 5— 6.5 mm. broad in anthesis, white; sepals ob- 

 long, whitish; petals pinnately cleft, spreading; anthers oblong, filaments 

 very short ; disk not lobed ; ovary free nearly to the base, glandular puber- 

 ulent, styles very short, stigmas crescent-shaped; capsule ovoid, dehiscing 

 early into a mitre-shaped fruit. 



In rich deciduous forests. Distributed from New Hampshire and Ver- 

 mont northward in Quebec to about latitude 47" N, and west to central 

 Minnesota about the same latitude. It extends south into western North 

 Carolina and eastern Tennessee and westward in its southern range to the 

 middle of Missouri. 



The species is very variable as to foliage. The greatest variation is 

 found in the cauline leaves which are either sessile and practically oppo- 





