234 ONAGRACEiE. Gaura. 



Herts, with mostly sessile alternate leaves ; flowers in spikes or racemes, white or 

 rose-colored, turning to red. 



A genus of about 20 species, belonging chiefly to the warmer portions of N. America east of the 

 Rocky Mountains, extending into Mexico. 



1. Gr. parviflora, Dougl. Annual, usually with a dense soft spreading pubes- 

 cence, erect, 1 to 5 feet high : leaves ovate to lanceolate, repand-denticulate : flowers 

 very small, in rather dense strict spikes : petals spatulate-ohlong, scarcely unguicu- 

 late, shorter than the calyx-lobes : fruit 3 to 4 lines long, obscurely 4-angled at the 

 summit, 4-uerved, about 2-seeded, indehiscent. — Torr. & Gray, Fl. i. 519; Bot. 

 Mag. t. 3506 ; "Watson, Bot. King Exp. 113. Schizocarya micrantha, Spach, 

 Monog. Onagr. 62. 



Fort Mohave (Cooper) ; Oregon (Douglas, Halt) ; Salt Lake ( Watson) ; more common eastward 

 from Colorado to New Mexico and Texas. 



13. HETEROGAURA, Rothrock. 



Calyx-tube with a short obconic prolongation above the small ovary ; limb 4-cleft, 

 spreading, deciduous. Petals 4, entire, with claws. Stamens 8 ; filaments naked ; 

 anthers ovate-cordate, attached by the base and not versatile ; those opposite to the 

 petals on shorter filaments, lanceolate, acute, sterile. Ovary 4-celled, with a solitary 

 pendulous ovule in each cell : style long : stigma discoid, entire. Fruit nut- like, 

 indehiscent, obovoid, 2-4-celled, 1-2-seedecl. — Rothrock, Proc. Am. Acad. vi. 354. 

 A single species : a Clarkia in every respect but the fruit and stigma. 



1. H. Calif ornica, Eothr. 1. c. Smooth or sparingly puberulent, 1 to 1| feet 

 high : leaves lanceolate, entire, 1 or 2 inches long, tapering to a slender petiole : 

 petals purple, narrowly spatulate, 2 lines long : anthers very small : fruit 2 lines 

 long, obovate, 4-angled, 1| lines long, smooth, on a short spreading pedicel. — 

 Gaura heterantha, Torrey, Pacif. P. Pep. iv. 87. 

 In the mountains from Fort Tejon to Placer Co. 



14. CIRC2EA, Linn. Enchanter's Nightshade. 



Calyx-tube slightly prolonged above the ovoid ovary, the base nearly filled by 

 a cup-shaped disk ; the limb 2-parted, deciduous. Petals 2, obcordate. Stamens 

 2, alternate with the petals ; anthers small, nearly round. Ovary 1 - 2-celled : 

 ovule solitary in each cell, ascending. Fruit indehiscent, pear-shaped, covered with 

 hooked bristles. — Low slender erect perennial herbs ; leaves thin, opposite, petio- 

 late ; flowers small, white, in terminal and lateral raeemes ; fruit on slender spread- 

 ing or deflexed pedicels. 



A genus of 3 or 4 species, inhabiting cool damp woods throughout the northern portion of the 

 hemisphere. 



1 . C. Pacifica, Ascherson & Magnus. Mostly glabrous : stem usually simple, 

 | to 1 foot high, from a perennial slender running rootstock : leaves ovate, rounded 

 or cordate at base, somewhat acuminate, repandly denticulate, 1 to 2-| inches long ; 

 the slender petioles about as long : racemes without bracts : flowers half a line long : 

 calyx white, with a very short tube : fruit a line long, rather loosely covered with 

 soft hairs curved above, 1-celled, 1-seeded. — Bot. Zeit. xxix. 392. C. alpina, var. 

 intermedia, Watson, Bot. King Exp. 11.3. 



In the mountains from "Washington Territory to the Yosemite Valley, and eastward to Colorado 

 and the Saskatchewan. Distinguished from O. alpina by its less toothed leaves, and more clearly 

 iiom.C Ltdetiana by its smaller less acuminate leaves, smaller flowers, and smaller less bristly 

 1-celled fruit. 



