202 SAXTIFRAGACE AS. TIARELLA. 
HEUCHERA, 
a line long. connivent over the recurved styles: capsule globose nearly 
free from the calyx =Common along mountain streams at low elevations. 
Brit. Columbia to Oregon. 
14 TIARELLA L. Gen. n. 560. 
Perennial herbs with simple or trifoliolate leaves and small 
white*flowers in simple or paniculate racemes. Calyx campanu- 
late, nearly free from the ovary, 5-parted, white and petal-like, 
valvate in the bud. Petals 5, entire, small, with short claws, in 
ours persistent. Stamens 10, inserted with the petals into the 
base of the calyx: filaments filiform, exserted, the 5 opposite 
the sepals longest: anthers ovate, 2-celled: styles 2; stigmas sim- 
ple. Capsule 1-celled, with 2 parietal placentew, 2-valved, the 
valves very unequal. Seeds rather large, subglobose, smooth and 
shining. | 
T. trifoliata L.Sp 406. Softly hirsute: stems slender, ascending, 
6-12 inches high, from slender creeping rootstocks: leaves trifoliolate, the 
middle leaflet ovate with cuneate base, slightly 3-lobed; the lateral ones 
oblique, 2-lobed, all coarsely and repandly apiculate-dentate, on slender 
petioles: flowers numerous, in an elongated narrow panicle: calyx cleft 
nearly to the base, the lanceolate lobes about a line long, acute; petals 
tiliform, nearly twice as long as the calyx; filaments filiform, as long as the 
petals ; valves of the capsule membranaceous, tipped with the slender per- 
sistent styles, the larger one 6 lines long, more than twice as long as the 
other. Common in forests, Alaska to California. 
T. laciniata Hook. Fl. i, 239, t. 77. Scabrous-hirsute: stems about 
3-leaved : leaves trifoliolate, the terminal leaflet deeply 3-cleft, the lateral 
ones 2-cleft, the segments broadly lanceolate, laciniate-pinnatifid: panicle 
loose: petals filiiorm and resembling the filaments. ancouver Island to 
Washington. “ 
T. uuifoliata Hook. 1. c. 238 t. 81. Sparingly pubescent or nearly 
glabrous: stems slender, erect or ascending, 6-16 inches high from slender 
running rootstocks: leaves simple, cordate, acute, obscurely 5-7-lobed, 
coarsely apiculate-dentate, 1-3 inches in diameter, on long slender petioles: 
flowers numerous, in a narrow panicle; calyx cleft to near the base ; petals 
filiform, twice the length of the rather obtuse oblong-ovate calyx-lobes: 
valves of the capsule merely convex, the largest one oblong, acute. 5 lines 
long, twice as long as the other. Common in the forests of the high 
mountains, Alaska to California. 
15 HEUCHERA L. Gen. n. 320. 
Perennial herbs with mostly radical palmatelv veined leaves 
with partly free stipules and rather small flowers in terminal 
panicals or spikes. Calyx campanulatc, coherent with the ovary 
below, 5-cleft, the segments imbricate in the bud. Petals 5, 
sometimes wanting, small, entire. Stamens 5, inserted alter- 
nately with the petals into the throat of the calyx; anthers 2- 
celled ; styles 2; capsule 1-celled with 2 parietal placente, many- 
seeded, 2-beaked, dehiscent between the beaks; seeds horizontal, 
oval, minutely muriate or hispidulous. 
* Filaments and styles filiform, much exserted: calyx short obconic 
or campanulate, the lobes spreading, equal: petals mostly persistent, 
at length often revolute or twisted: panicle effuse. 
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