an erect annual herb, branched from the base or simple; stem dusky strigose-hirsute or pubescent with pallid hairs, a little shrubby at the base, 6–30 in. high; branches erect or ascending, terete, rather slender, wiry, leafy; leaves mostly opposite, linear or linear-lanceolate, obtuse, somewhat narrowed towards the base, pinnatifid-dentate, sessile or subsessile, somewhat viscid-pubescent, 1/3–1 1/6 in. long; floral leaves lanceolate, subentire or few-toothed, pubescent, ciliate, 1/3– 1/2 in. long; spikes short, dense; flowers 1–1 3/4 in. long, alternate, crowded, yellowish, closed during the day, open at night and then sweetly fragrant; calyx 1/4– 1/3 in. long; teeth narrow, pubescent; corolla-tube slender, glandular-puberulous outside; limb spreading, 2/5– 1/2 in. in diam.; lobes bifid; throat shortly pubescent; capsule glabrous, 1/3 in. long. null
