SAXIFEAGACEAE 503 



7. HEUCHERA L. 



Perennial, mostly scapose herbs, with horizontal rootstocks and pubescent or glandu- 

 lar foliage. Leaves chiefly basal : blades thickish, coarsely toothed or lobed, long- 

 petioled : petioles with adnate stipules. Flowers perfect, in rather narrow panicled cymes. 

 Sepals 5, unequal, imbricated. Petals 5, or very rarely wanting, inserted at the top of the 

 hypanthium, entire. Stamens 5, inserted with the petals : filaments slender. Ovary 

 mostly inferior, 1-celled : styles 2, elongated. Ovules numerous, borne on 2 parietal 

 placentae. Capsule 2-beaked, 2-valved at the top between the styles. Seeds numerous 

 with a muricate or hispidulous testa. ALUM-BOOT. EOCK GERANIUM. 



Flowering stems with 1-3 or rarely 4-5 leaves. 



Stamens slightly, if at all exceeding the petals : hypanthium decidedly turbinate at maturity. 

 Leaf-blades with rounded lobes and crenate teeth : petals spatulate, 2-2.5 



mm. long, obtuse. 1. H. pubescent. 



Leaf-blades with sharp lobes and very sharp teeth : petals oblanceolate, 2.5-3 



mm. long, acute. 2. H. aceroides. 



Stamens about twice as long as the petals : hypanthium campanulate during 



anthesis or slightly turbinate at maturity. 

 Stems and petioles glabrous or puberulent : hypanthium and calyx 3-4 mm. 



long during anthesis. 3. H. Curtisii. 



Stems and petioles yillous : hypanthium and calyx 2 mm. long during anthesis. 4. H. crinita. 

 Flowering stems scape-like : leaves reduced to scales. 



Flowers small : hypanthium and calyx 2-5 mm. long during anthesis, slightly 



oblique. 



Petioles and stems hirsute or villous, rarely glabrate. 

 Leaf- blades deeply lobed, the lobes acute. 



Leaves with ovate or suborbicular blades, the lobes triangular. 



Petioles sparingly pubescent or glabrate at maturity : pedicels^less 

 pubescent than the hypanthium : middle lobe of the leaf-blade 

 relatively narrow. 5. H. vittosa. 



Petioles densely and shaggy pubescent : pedicels more pubescent than 



the hypanthium : middle lobe of the leaf-blade relatively broad. 6. H. macrprhiza. 

 Leaves with broadly reniform blades, the lobes broadly ovate. 4. H. crinita. 



Leaf-blades shallowly lobed, the lobes obtuse. 



Hypanthium and calyx about 2 mm. long during anthesis : petals white. 7. H. parviflora. 

 Hypanthium and calyx 4-5 mm. long during anthesis : petals greenish 



or purple. 8. H. hirsuticaulit. 



Petioles glabrous or puberulent : stems rarely slightly hirsute. 

 Petals spatulate to oblong, shorter than the sepals. 



Hypanthium fully 1 mm. long during anthesis, this together with the 



calyx becoming 4-5 mm. long. 9. H. Americana. 



Hypanthium barely 1 mm. long during anthesis, this together with the 



calyx becoming 3 mm. long. 10. H. calycosa. 



Petals oblanceolate, twice as long as the sepals. 11. H. lancipetala. 



Flowers large : hypanthium and calyx 6-10 mm. long during anthesis, decidedly 



oblique. 12. H. longiflora. 



1. Heuchera pub6scens Pursh. Stems erect, 3-10 dm. tall, usually bearing several 

 leaves, densely glandular-pubescent, at least above : leaf-blades suborbicular, varying from 

 orbicular-ovate to orbicular-reniform, 5-10 cm. broad, ciliate, 5-7-lobed, sparingly pubes- 

 cent on both sides, or glabrous, the lobes rounded, crenate : panicle 1-4 dm. long, lax : 

 flowering hypanthium campanulate, slightly oblique, together with the calyx 5-6 mm. 

 long, minutely glandular : sepals ovate to ovate-oblong, obtuse : petals firm, spatulate, 

 2-2.5 mm. long, entire, slightly exceeding the sepals, eroded, obtuse : stamens slightly if at 

 all exserted. 



In woods, Pennsylvania to North Carolina and Tennessee. Spring and summer. 



2. Heuchera aceroides Eydb. Similar to H. pubescens in habit. Leaf -blades ovate, 

 sharply lobed, the lobes dentate or serrate-dentate with very sharp teeth : flowering 

 hypanthium long-campanulate, very oblique, together with the calyx 6-8 mm. long : sepals 

 oblong: petals delicate, oblanceolate, 2.5-3.5 mm. long, manifestly surpassing the sepals, 

 acute, eroded : stamens included. 



On hillsides, near Asheville, North Carolina. Spring. 



3. Heuchera Cuitisii T. & G. Stems erect, 5-10 dm. tall, glabrous below, puberu- 

 lent above : basal leaves with suborbicular or reniform blades 3-8 cm. broad, with rounded 

 lobes and crenate, sometimes hispidulous above, ciliate : stem-leaves with orbicular or 

 broadly ovate blades and acuminate teeth : panicle open, with diverging branches : hy- 

 panthium puberulent: sepals oblong, 1.5-2 mm. long, obtuse: petals purple, spatulate, 

 scarcely surpassing the sepals, puberulent. 



In rich woods, Virginia and North Carolina. Spring and early summer. The variety in which the 

 stem bears 3-5 leaves with cordate crenate blades and terminates in a narrow panicle, and whose 

 corolla consists of minute petals is H. CurtMi crendta Rydb 



4. Heuchera crinita Eydb. Stems stout, 5-8 dm. tall, with several scales or 1-3 

 leaves, like the petioles villous with brownish hairs. Leaves mainly basal ; blades sub- 

 orbicular and more or less reniform, 9-22 cm. broad, glabrous or sparingly hispidulous 



