202 SAXIFRAGACE^ TIARELLA. 



HEUCHEPA. 



a l : ne 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 placentae, 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. Sca-brous-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 filiform and resembling the filaments. Vancouver 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 palrnately 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 placentae, 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. 



