^r? 



378 



C, 0. Rosendahl. 





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white, greenish yellow, violet-tinged or purple. Stamens 10 or 5, when 

 only 5 either opposite the sepals or opposite the petals ; filaments short 

 or sometimes exceeding the anthers; anthers oblong, cordate or renifonn. 

 Disk lobed or entire, more or less lining the hollow axis or covering the 

 ovary. Carpels 2, united into a 1 -celled pistil with 2 parietal placentae; 

 styles 2, distinct, , short and thick or slender and tapering into the stigmas; 

 stigmas rounded, crescent-shaped or 2 — 4-lobed; ovules numerous. Capsule 

 2-beaked, dehiscing early into a mitre-or cup-shaped fruit. Seeds nume- 

 rous, smooth and shining or black spotted. Perennial herbs, by creeping 

 or ascending rhizomes, in some species producing leafy runners; flowering 

 stems lateral, naked or with i — 3 alternate or opposite leaves. Leaves 

 alternate on the rhizome, long-petioled, rounded, cordate, or reniform, var- 

 iously toothed or lobed. Inflorescence racemose, with simple, spike-like 

 racemes, or often with several 2-flowered cymes towards the base. 



A genus of about i 2 species of the north temperate and boreal regions 

 of North America and Asia. 



Key to the Sections. 



F 



A. Axis cup-shaped, campanulata or turbinate, longer than 

 broad; sepals oblong or ovate, erect or only slightly spread- 

 ing at the tips; petals white or violet-tinged, pinnately cleft 

 with ascending divisions, palmately 3— 5-fid or entire; anthers 



oblong; stigmas capitate or obscurely crescent-shaped . . . Sect. I. Eulllitella 



_ d 



B, Axis saucer-shaped or strongly flattened, much broader than 

 long; sepals triangular, strongly spreading or reflexed; petals 

 greenish -yellow or purple, pectinate-pinnatifid, with the divis- 

 ions spreading nearly at ringht angles; anthers cordate or 



reniform; stigmas pointed or strongly 2— 4-lobed Sect. II. Slitellastra 



Analytical key to the species. 



Sect. I. Eumitella 



^. Stamenis 1u, petals pinnately cleft, 2 cauline leaves opposite 1. Jtf. diphylla 

 2. Stamens 5, opposite the sepals, petals palmately 3— 5-cleft 

 or entire 



a. Leaves rounded, ovate, cordate or reniform, toothed or 

 crenate, all basal 



(h) Petals with slender fdifonu hmb, trifid above the middle 

 with slender branches, or entire, mid-vein of sepals 

 unbranched, flowers secund 2. il/. stauropeUda 



(2) Petals with broad limb, cuneate and trifid or oblanceo- 

 late and entire, mid-vein of sepals more or less branched, 

 flowers not secund ^. M. trijida 



b. Leaves cordate-triangular, angularly lobed, petals palmately 



3— 5-cleft, one cauline leaf 4. iV/. diversifoHc^ 



Sect. II. Mitellastra 

 \. Stamens 10, ovary free from the axis to the base 5. J/, ntda 



2. Stamens 5, ovary more or less united with the 



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