SAXIFRAGACEAE (SAXIFRAGE FAMILY) 121 



exserted. Ovary almost entirely superior; placentae 2, parietal but almost 

 basal. Capsule membranous. (Diminutive of G. tiara = a mitre or 

 turban ; from the form of the pistil.) 



A. Leaves merely 3 -5-lobed. C. E. T. unifoliata 



AA. Leaves with 3 leaflets. 



B. Leaflets coarsely dentate. W. C. T. trifoliata (3-LEAVED COOLWORT) 



BB. Leaflets deeply lobed or cleft. W. C. T. laciniata 



HEUCHERA (ALUMROOT) 



Perennial. Calyx tube various, often oblique ; segments often very 

 unequal. Petals clawed. Ovary partly inferior; placentae 2, parietal; 

 styles 2, distinct. Capsule 2-beaked. (Honor of J. H. Heucher, a German 

 botanist.) 



A. Flowers in a loose panicle. 

 B. Calyx cup about as long as wide; stamens at least twice as long as the free calyx 



segments. 



C. Lobes of the basal leaves acute. W. C. E. H. glabra 



CC. Lobes of the basal leaves rounded. 

 D. Basal leaf blades decidedly longer than wide. 



E. Petioles and stems glabrous. C. H. glaberrima 



EE. Petioles and lower portion of the stems hairy. W. C. H. diversifolia 



DD. Basal leaf blades not or hardly longer than wide. W. C. E. H. micrantha 



BB. Calyx cup about twice as long as wide; stamens i$-2 times as long as the free 



calyx segments. 



F. Leaf blades cordate at base. E. H. rubescens 



FF. Leaf blades cuneate to rounded at base. E. H. cuneata 



AA. Flowers in a spike or a spikelike panicle. 



G. Stamens about equaling the free calyx segments; calyx cup hemispheric, densely 

 hairy. W. H. pilosissima 



GG. Stamens much shorter than the free calyx segments; calyx cup various, some- 

 times hairy. 

 H. Calyx 3-5 mm. long, its cup saucer-shaped to shortly campanulate. 



I. Lobes of the leaf blades again 3-lobed. E. H. gracilis 



II. Lobes of the leaf blades not again lobed. 



J. Calyx campanulate, white or yellowish or pinkish, the free segments almost 



erect. 



K. Plants glabrous or glandular-pubescent merely on scape and inflorescence. 

 C. E. H. hallii 



KK. Plants more or less glandular-hirsute. (See NN.) 



JJ. Calyx saucer-shaped, green, the free segments spreading. E. H. parvifolia 

 HH. Calyx 5-10 mm. long, its cup deeply campanulate to urn-shaped. 

 L. Calyx greenish. 



M. Petioles and flowering branches villous. W. H. cylindrica 



MM. Petioles and flowering branches glabrous or minutely glandular-puberu- 

 lent. E. H. tenuifolia 



LL. Calyx yellowish. 



N. Leaf lobes deep, broadly ovate. C. H. suksdorfii 



NN. Leaf lobes shallow, rounded. 



O. Leaf blade densely glandular-pubescent. C. E. H. ovalifolia 



OO. Leaf blade glabrous or hairy only on the veins or merely puberulent. E. 



H. glabella 



