46 SYNOPSIS OF THE FLORA OF COLORADO. 



scarcely prominent 5 seeds numerous in each cell, obovate, with a 

 smooth and thin testa. Purgatory Biver, Dr. Bell. 



(ENOTHERA SERRULATA, Nutt. Hall & Harbour, 179; B. H. Smith. 

 Plains of the Platte and Monument Park, Coulter. On the plains be- 

 tween Denver and Colorado Springs, Porter. 



CENOTHERA BREVIFLORA, T. & G. ( (E. NuttalUi, T. & G.) Perennial, 

 acauleseeiit ; leaves petioled, 2 / -6 / long, lanceolate, acuminate, inter- 

 ruptedly pinnately-parted, the segments lanceolate, acuminate, tootbed 

 or entire; calyx-tube marcescent, much shorter than the leaves, filiform, 

 dilated at the summit, segments lanceolate, shorter than the obovate, 

 yellow petals, scarcely exceeding the style; stigma capitate, entire; 

 capsules large, sessile, submembranous, oblong and attenuate above, 

 sub-tetragonal and sulcate on the sides, very- many-seeded; seeds smooth, 

 somewhat ascending, terete, oblong, slightly reiiiforai, 2 series in each 

 cell. Hall & Harbour, 176. 



STENOSIPHON l VIRGATUS, Spach. Spikes in fruit sometimes nearly 

 1 long ; bracts subulate, longer than the ovary, rather persistent ; calyx 

 pubescent, tube exceedingly slender, "-5" long ; petals rather large 

 in proportion ; ovary tomentose-pubescent. Parry ; Canby. 



GAURA PARVIFLORA, Dougl. Stem tall, erect, more or less branched, 

 20.50 high, clothed, besides the long, soft-villous hairs, with a minute, 

 slightly glandular pubescence ; leaves ovate-lanceolate, l'-3' long, 

 acute or acuminate, repand-denticulate, clothed on both sides with a soft, 

 velvety pubescence; spikes virgate, dense, strict, in fruit often elongat- 

 ing 1" or more; bracts lanceolate-subulate; flowers very small, rose- 

 colored ; calyx-tube shorter than the glabrous ovary and longer than the 

 segments ; petals spatulate-oblong ; anthers oval, retuse, attached by 

 the middle; lobes of the stigma very short; fruit sessile, oblong-clavate, 

 4-nerved, obtusely angled above, 3"-" long. On the plains near Den- 

 ver, Dr. Smith. Hall & Harbour, 180 ; Parry, 181 ; Canby. Caiion 

 City, Red field. 



GAURA COCCINEA, Nutt. Canescent, puberulent or glabrate ; stems 

 suffruticose and fastigiately branched from the base, G'-lii' high, very 

 leafy, ascending; leaves lanceolate, linear-oblong or linear, repand-den- 

 ticulate or entire, 6"-12" long, closely sessile; flowers in simple spikes 

 terminating the leafy branches, rose-color, turning to scarlet; bracts 

 linear, rather persistent, longer than the ovaries ; calyx-segments linear- 

 oblong, shorter than the narrow infundibuliform tube, as long as the 

 roundish, unguiculate petals ; fruit elliptical, sessile, short, terete, 1- 

 sided above. Hall & Harbour, 181; Dr. Smith; B. H. Smith; Canby. 

 Plains around Denver and Colorado Springs, Porter. Plains of the 

 Platte, Coulter. 



ALPINA, L. Hall & Harbour. 



LYTHRTJM ALATUM, Pursh. Plains near Denver, Dr. Smith. 



1 STENOSIPHON, Spach. Tube of the calyx filiform or almost capillary, much prolonged 

 beyond the ovary, recurved or declined after flowering, at length deciduous ; the limb 

 4-parted, much shorter than the tube. Petals 4, unguiculate, unequal. Stamens 8, 

 erect, the alternate ones a little shorter ; filaments capillary ; anthers oblong, fixed by 

 the middle. Ovary oval, 1-celled, with 4 suspended ovules'; style erect, filiform, dila- 

 ted at the apex; stigma 4-lobed. Fruit (very small) coriaceous and indehiscent, ovate, 

 convex externally, flatfish within, about 8-ribbed, 1- seeded. A tall, perennial heib, 

 with virgate branches, and scattered linear-lanceolate, sessile, acute, nerveless, entire 

 leaves, gradually reduced to bracts. Flowers (white) sessile, crowded, in long and 

 strict, virgate spikes. T. $' (*. Fl. JN 7 . Am. 



