Mitella. SAXIFRAGACE^. 



199 



Exp. 95. Lithoplircmma tenella & L. glabra (a smootlier form), Xutt. in 'J'-.n- 

 & Gray, Fl. i. 584 ; Gray, I. c. 



Kocky moist grouiul, throu.i;li tlic iioitlicrn jOTrtioii of tlic Sierra Nevada ; tliciice to the Horky 

 Mountains. Caly.K 1 or 2 lines lung. Petals 2 or a lines long, generally jnnk or rose-color. 

 Granulate bulblets copious at the root, and sometimes in the place of llowers in the raceme. 



6. TIARELLA, Linn. 

 Calyx 5-parted ; the base almost free from the ovary, the lobes more or less 

 colored. Petals 5, undivided, small, with sliort claws. Stamens 10 : filaments long 

 and slender : anthers with 2 parallel cells. Ovary 1-celled, compressed, 2-horned 

 (the horns or lobes tapering into long filifonu styles), soon unequal and dehiscent, 

 one valve or carpel in fruit lanceolate-elongated, the other remaining very much 

 shorter. Seeds rather few and only at the base of each parietal placenta, globular, 

 with a smooth and shining crustaceous coat. — Perennial low or slender herbs, often 

 multiplying by summer runners ; with palmately lobed or divided alternate leaves, 

 and sometimes scaly stipules at the base of llie })ctiole, and a teriuinal raceme or 

 panicle of small white flowers. 



A North American and North Asiatic genus of five species, one inhabiting the Atlantic States 

 and two the Pacific coast. 



1. T. unifoliata, Hook. Somewhat pubescent or hairy: flowering stems a span 

 to a foot or more long : leaves thin, cordate, either rounded or somewhat triangular, 

 3-5-lobed and the lobes crenate-toothed ; the radical ones slender-petioled ; the 

 cauline mostly one, smaller, and short-petioled, or sometimes (mainly on decumbent 

 and later flowering shoots) 2 or 3 similar to the radical: panicle raceme-like and 

 loose: petals small and inconspicuous, almost filiform. — Fl. i. 238, t. 81. Ileuchera 

 lonr/ipetala, Mo^ino, Ic. Ined. t. 423. 



Shaded ravines and woods, San Mateo Co. {Kellogg), Mendocino Co. (Bolandcr), and north 

 through British Columbia. The Californian and some of the more northern specimens incline to 

 have elongated and 2-3-leaved flowering stems, and whole plant more hairy, the var. procera. 

 but this is merely a lu.\uriant state. The lobing of the leavers varies, so that it may pass into 



T. TRIFOLIATA, Liuu. (T. stcnopcfcdii, Presl), which extends from the mountains of Oregon to 

 Alaska and N. W. Asia, has most of its leaves divided into three distinct leaflets. 



7. MITELLA, Tourn. Mitue-woiit. 

 Calyx short ; tlie broad tube coherent with the base of the ovary and dikik-d 

 beyond it, 5-lobed ; the lobes valvate in the bud, spreading. Petals 5, inserted on 

 the throat of the calyx, very slender, pinnately parted or 3-cleft ; the divisions 

 almost capillary. Stamens 10 or 5, very short: anthers cordate or reniform, 2- 

 celh'd. Ovary short and broad, 1-celled, with 2 parietal or almost basal placent:e, 

 mainly or partly superior : styles 2, very short : stigmas capitellate. Capsule glob- 

 idar or depressed, hardly at all lobed, opening across the broad summit. Seeds 

 several to each placenta, obovate, with a firm and smooth black and sliining close 

 crustaceous coat. — Small perennials (N. American and N. E. Asian); witlx more or 

 less creeping slender rootstocks and summer runners, small and greenish or some- 

 times white flowers in a simple raceme, and cordate or round-reniform simple k'aves, 

 which are all radical and long-petioled, or two or more on lk)\vering stems, these in 

 one species (of E. Xorth America) ojiposite. Petioles, i^-c, mostly loosely hirsute. 



1. M. Bre'weri, (Jray. Leaves all in a cluster on the rootstock, round-renifnrni, 

 creuate and civnately incised, of comparatively firm texture, soon nearly u'lahruiis. 



