16. Œ. serrulàta, Nutt. Slender (3--15´ high), simple or branched, canescent or glabrous; leaves linear to lanceolate (1--3´ long), _irregularly and sharply denticulate; calyx-tube broadly funnnelform (2--4´ long)_, strongly nerved; petals broadly obovate (3--4´´ long), crenulate; capsule 9--15´´ long.--Wisc. and Minn. to Mo., Tex., and N. Mex. 5. GAÙRA, L. Calyx-tube much prolonged beyond the ovary, deciduous; the lobes 4 (rarely 3), reflexed. Petals clawed, unequal or turned to the upper side. Stamens mostly 8, often turned down, as is also the long style. A small scale-like appendage before the base of each filament. Stigma 4-lobed, surrounded by a ring or cup-like border. Fruit hard and nut-like, 3--4-ribbed or angled, indehiscent or nearly so, usually becoming 1-celled and 1--4-seeded. Seeds naked.--Leaves alternate, sessile. Flowers rose-color or white, changing to reddish in fading, in spikes or racemes, in our species quite small (so that the name, from γαῦρος, _superb_, does not seem appropriate). [*] _Fruit sessile or nearly so._ 1. G. biénnis, L. _Soft-hairy or downy_ (3--8° high); _leaves oblong-lanceolate_, denticulate; _spikes wand-like; fruit oval or oblong_, acute at both ends; 2--3´´ long, ribbed, downy.--Dry banks, N. Y. to Minn., and southward. Aug. 2. G. parviflòra, Dougl. Soft-villous and puberulent, 2--5° high; _leaves ovate-lanceolate_, repand-denticulate, _soft-pubescent; spikes dense; fruit oblong-clavate_, narrowed to both ends, _4-nerved_, obtusely angled above, 3--4´´ long.--Mo. to La. and westward. 3. G. coccínea, Nutt. _Canescent, puberulent or glabrate_ (6--12´ high), very leafy; _leaves lanceolate, linear-oblong or linear_, repand-denticulate or entire; flowers in simple spikes, rose-color turning to scarlet; _fruit terete below, 4-sided and broader above_, 2--3´´ long.--Minn. to Kan., and westward. [*][*] _Fruit slender-pedicelled._ 4. G. fílipes, Spach. Nearly smooth; stem slender (2--4° high); leaves linear, mostly toothed, tapering at base; branches of the panicle very slender, naked; fruit obovate-club-shaped, 4-angled at the summit.--Open places, Va. to Fla., west to Ill., Kan., and Ark. 6. STENÓSIPHON, Spach. Calyx prolonged beyond the ovary into a filiform tube. Filaments (8) not appendaged at base. Fruit 1-celled, 1-seeded. Otherwise as Gaura, which it also resembles in habit. (From στενός, _narrow_, and σίφων, _a tube_.) 1. S. virgàtus, Spach. Slender, 2--4° high, glabrous, leafy, leaves narrowly lanceolate to linear, pointed, entire, much reduced above; flowers numerous in an elongated spike, white, ½´ long; fruit pubescent, oblong-ovate, 8-ribbed, small.--E. Kan. to Col. and Tex. 7. CIRCÆ̀A, Tourn. ENCHANTER'S NIGHTSHADE.