200 Saxifragaceae 
carpels 2, very unequal. Seeds relatively few. (Diminutive of Gk. tiara—mitre or tur- 

ban; from the form of the pistil.) 
A. Leaves merely 3—5-lobed. -C. E. 
T. unifoliata Hook. ’ 
AA. Leaves with 3 leaflets. 
B. Leaflets coarsely dentate. W. C. 
T. trifoliata L. (3-leaved Cool-wort) 
BB. Leaflets deeply lobed or cleft. W. C. 
T. laciniata Hook. 
HEUCHERA ALUM-ROOT 
Perennial; stems scape-like or leafy. Flowers in racemes or panicles. Calyx-tube 
various, often oblique; segments 5, ovate or oblong or triangular, erect or spreading, often 
very unequal. Petals obovate, spatulate or oblanceolate, often somewhat clawed. Sta- 
mens 5, opposite the sepals, erect. Ovary partly inferior, I-celled; 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 Willd. | | 
CC. Lobes of the basal leaves rounded. 
D. Basal leaf-blades decidedly longer than wide. 
FE.  Petioles and stems glabrous. C. 
H. glaberrima Rydb. 
EE.  Petioles and lower portion of the stems hairy. W.C. 
H. diversifolia, Rydb. 
DD. Basal leaf-blades not or hardly longer than wide. W. C. ECA fae 
tallii.) H. micrantha Doug. 
BB. Calyx-cup about twice as long-as wide; stamens 114—2 times as long as the 
free calyx segments. 
F. Leaf-blades cordate at base. E. 
H. rubescens Torr. 
FF. Leaf-blades cuneate to rounded at base. E. 
H. cuneata, How. 
AA. Flowers in a spike or a spike-like panicle. 
G. Stamens about equaling the free calyx-segments; calyx-cup hemispheric, densely 
hairy. W. H. pilosissima F. & M. 
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. 
H. gracilis Rydb. 
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 inflor- 
escence. C. E. (H. lloyd: H. grossulariifolia. ) 
H. hallii Gray 
KK. Plants more or less glandular-hirsute. (See NN.) 

