Stamens 10, the filaments not dilated basally, straight, glabrous or with short hairs; anther dehiscing by terminal pores or [+-] elongated slits, inverting just before anthesis, appendages uncommon, small, smooth, paired, at anther--filament junction, or anthers hippocrepiform, dehiscing by slits, appendages none, surfa ce usually smooth, endothecium at most poorly developed, pollen monadinous.
Stamens 10, the filaments not dilated basally, straight, smooth; anther dehiscing by slits widening considerably apically, inverting some time before anthesis, appendages long, strongly papillate, paired, at anther-filament junction, surface papillate, endothecium present, pollen monadinous.
Stamens (8-)l0, included, the filaments [+ or -] strongly dilated basally, [+ or -] straight, unicellular-pubescent or smooth; anthers tetrasporangiate, inverting only just before anthesis, slightly roughened, with a pair of dorso-apical spurs, lacking a fibrous endothecium, lacking disintegration tissue, dehiscing by terminal pores or slitlike pores.
Androecium: stamens 4-5(-12), isomerous, alternipetalous, sometimes strongly zygomorphic and adnate to corolla tube or mouth, rarely some staminodal or even obsolete (Hoppea): anthers tetrasporangiate, usually introrse (extrorse in Gentiana) and dithecal; dehiscing via a longitudinal slit or rarely by terminal pores (Exacum); occasionally connate (Voyria); occasionally connective with one to two apical glands (Sebaea); rarely with long thread-like projections (Urogentias).
Androecium: stamens isomerous, alternipetalous and adnate to corolla-tube; anthers tetrasporangiate and dithecal, dehiscing via longitudinal slits; connective forming a small apical point.
Androecium: stamens [1 (Usteria)-]4-5(-16), isomerous, alternipetalous, adnate to corolla: anthers bisporangiate or tetrasporangiate, dithecal and introrse; dehiscing via longitudinal slits; usually isostylous, occasionally heterostylous (Gelsemieae); usually free, rarely connivent (Gardneria).
hirsuta, the pedicel of the male flower will frequently elongate and bend over the female flower causing the dehiscing anthers to come in direct contact with the stigmatic surface (Agren and Schemske, pers.
At pollination, dehiscing anthers were brushed across the stigma of the female flower until it was densely covered with pollen.