dorsifixed


Also found in: Medical.

dorsifixed

(ˈdɔːsɪˌfɪkst)
adj
(of an anther) attached dorsally to the filament
References in periodicals archive ?
5 mm wide, dorsifixed, reddish pink in colour, bilobed and tetralocular with dehiscence-slit facing the interior of the flower (introrse).
dithecal, tetrasporangiate, white, dorsifixed, latrorsely dehiscent, epidermis striate; nectary disk fleshy, conspicuous, light green, tetra- or pentagonal, with numerous stomata.
Filaments without depressions accommodating anthers, which are dorsifixed 3 3.
There are six free stamen, with wider filaments at the base; the anthers have asymmetric tips and are dorsifixed, with longitudinal dehiscence, and introrse (Figure 11-m).
Similarities between flowers of Adenanthemum Conwentz and Itea include that the flowers are hermaphroditic, pedicellate, have a pentamerous and actinomorphic perianth with distinct whorls of sepals and petals, a valvate corolla, a haplostemonous androecium with antesepalous stamens, dorsifixed anthers with introrse dehiscence, a superior ovary (ovary position is variable in Itea), two fused styles, and a single, capitate stigma (Conwentz, 1886; Kubitzki, 2007a).
They are ten arranged in two whorls, each with 2 mm long white filament and 1 mm long dorsifixed yellow dithecous anther (Fig.
Staminate inflorescences capitate, 10-12 flowered in a single raceme, peduncle to 10 mm long, pedicels up to 1 mm long; perianth campanulate, 6 mm long, 6-lobed, each lobe 1 mm long; stamens 6 alternate with perianth lobes, anthers bilocular, dorsifixed, elliptic < 1 mm diameter, extrorse, generally 1 or 2 reduced to staminodes; the fine filaments connate basally, borne at the base of a pistillode 3 mm long; lower part of the perianth reduced to 2 or 3 small involucral bracts; indumentum densely short velutinous.
40 mm long, slightly complanate, white, the antepetalous ones adnate to the petals for 18-20 mm, the antesepalous ones adnate to the petals for 10-11 mm; anthers linear, 9-11 mm long, dorsifixed ca.
Staminate flowers symmetrical, trimerous, not widely open at anthesis, sepals 3 short, imbricate, free, petals 3, valvate, stamens 6, slightly exceeding petals at anthesis, anthers small, dorsifixed, oval-linear with sagittate base, pistillode reduced.
Stamens 5; filaments slender, adnate at middle of the corolla tube, slightly winged at base; anthers dorsifixed, bilobed, [+ or -] sagittate, creamy-white.
2016); distal portion of the pedicel dilated and cup shaped, hereafter called cupular pedicel; calyx often truncate and entirely surrounding the ovary; corolla slender, tubular, to 10+ cm in length, the tube formed by six free but marginally interlocking petals which are brightly colored (red, orange or yellow); and six epipetalous stamens with dorsifixed anthers that are either tetrasporangiate and longitudinally dehiscent, or each theca secondarily divided by transverse septae and apparently dehiscent through numerous apertures.
Stamens number eight to twelve, are opposite the sepals and petals, and have introrse, dorsifixed anthers that dehisce by longitudinal slits.