300 SAXIFRAGACEAE 
Stem 4 to 12 in. high. Leaves 1 to 3 in. long, tapering at base to a 
long leaf-stalk. Flowers white. Early spring, March to May. 
6. §. micranthidifolia, (Haw.) BSP. Lerruce Saxirrace. Flower 
scape somewhat viscid, 1 to 3 ft. high. Flowers small, white in a loose 
pyramidal cluster. Leaves inversely lance-shaped or oval, from a few 
in. to 1 ft. long. Coarsely toothed at margins. Bethlehem, Pa., and 
southward. May-June. 
7. §S. pennsylvanica, L. Tati orm Swamp Saxirrace. Plant 1 to 34 
ft. high. Leaves mostly basal, broad lance-shaped, 5 to 8 in. long by 
1 to 2 in. broad, tapering at base to short leaf stalk, borders toothed. 
Flowers yellowish-green on tall scape with a few small leaves or none. 
In wet places in all our range. May. 
8. §. stellaris, L. Fortose SaxirraAce. (8S. comosa, Britton.) Slen- 
der plant 2 to 6 in. high, with a rosette of lance-shaped leaves, broadest 
at apex with about 3 teeth. Flowers few, white, some of them replaced 
by small tufts of leaves. Mt. Katahdin, Maine, and northward. Summer. 
2. TIARELLA, L. 
Herbs, similar in many respects to Saaxifraga. There are, however, at 
the base of the leaf-stalks, small stipules, and the ovary, which is 2-lobed 
in Sawxifraga, has but a single lobe in Tiarella which is divided into 2 
unequal valves. Leaves nearly all basal on long leaf-stalks, broadly 
rounded and deeply 3-lobed to several lobed. 
T. cordifolia, L. (Fig. 1, pl. 60.) CooLwort. Fase MITERWoRT. 
Leaves basal, rounded, deeply 3- to 7-lobed. Flower scape 6 to 12 in. 
high, with a long narrow cluster of about a dozen white flowers. Calyx 
bell-shaped of 5 sepals; petals slightly longer than sepals. In moist 
woods in early spring, throughout our range. 
3. HEUCHERA, L. 
Perennial herbs with rounded, heart-shaped leaves, principally from the 
root. When leaves are found on the stem they are alternate. Calyx 
bell-shaped, 5-cleft, the tube adhering to the ovary. Petals small, often 
shorter than the sepals. Stamens 5; styles 2, slender; capsule 1-celled. 
1. H. americana, L. (Fig. 5, pl. 60.) Atum Roor. Stem 2 to 3 
ft. high, stout, hairy. Leaves all or nearly all from the base, on long 
leaf-stalks, round or roundish with 5 to 9 rounded lobes and with blunt 
teeth; the veinlets radiating from the stem insertion. Calyx broadly 
bell-shaped; petals very small, greenish. Stamens extending much _be- 
yond the calyx and petals. Dry woods, Conn., and southward. May- 
August. 
2. H. pubescens, Pursh. Downy Heucnrera. Plant much like the 
preceding, more decidedly downy, the lobes of the leaves deeper. Petals 
exceeding the calyx lobes, purplish. Stamens scarcely longer than the 
petals, Mountains of Pennsylvania and southward. May-June. 
¢ 
4. MITELLA, L. 
Herbs with the general character of Saxifrage. Leaves mostly basal 
but, in our species, the flower scape has, near the center, a pair of broad 
