staminode

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staminode

a rudimentary, infertile stamen that may be reduced in size.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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0.1 mm; flower 1.5-3 cm diam; sepals heteromorphic, two smaller ovate, 4-5 x 1.7-2.3 mm, glabrous, margin ciliated, three larger obovate and suborbiculares, 8-10 x 4-8 mm, tomentulose, margin glabrous; petals heteromorphic, yellow, petal vexilar obcordate, 9-17 x 5.5-12 mm, two laterals obovate, 10-17 x 6-13 mm, two abaxial obovate, 10-20 x 8-14 mm; stamens 7, heteromorphic, three largest, a central, 9-10 mm long, two laterals, 10-15 mm long, four smaller, median, 6-7 mm long, fillets 1.4-7 mm long, anthers 4-8 mm long; three staminodes, 3.5 4.5 mm long; ovary tomentulose, 10-17 x 0.1-0.5 mm, 21-25 ovulated, style 2-3.5 mm long.
In tissue culture-derived populations of date palm it has been frequently observed that despite standard practice of pollination, besides female carpels, staminodes also grow to form a cluster of 3-9 tiny seedless fruit-like structures (Fig.
'Frances Rivis' has attractive dark buds, producing large, nodding bell-shaped flowers in deep blue flushed violet with blue staminodes.
It is characterised by petioles 0.8-1 cm in length, compressed axis of inflorescence, and also by staminodes with compressed thecae.
argentea in the rather laxer, more graceful panicle, with longer, more flexuous, nodding branches, somewhat smaller spikelets, more delicate glumes, and in the longer, very slender staminodes of the fem.
(2) Organs are affected to various degrees: by differential shape, curvature, reduction, loss, increase in number, or transfunctionalization (e.g., in stamens by heteranthery or in staminodes).
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.
Monogynanthus is divided in two sections, each of them defined from the fruit (epicarp splitting or not): (i) Munbaca with two subsections, Eumunbaca and Mumbacucu, these defined by characters of the pistillate flower and fruit, and (ii) Ayri with two subsections, Symphyodon and Hexodon, defined by the staminodes either connected and forming a staminodial ring or reduced to six free teeth.
The presence of dioecy in the family has been supported on morphological evidence, i.e.: two floral morphs residing on different individuals and an apparent lack of functionality of the pistillode and the staminodes), but functional dioecy has not been tested in the field.
3 mm long; staminodes six, rose-colored, laminar at the base, linear-triangular, ca.
ex Mart., caracterized by the presence of 6 distinct, tooth-like staminodes in the pistillate flower ("Flos FEM: Corolla intus staminodiis dentiformibus inter se disjunctis"), and (ii) Symphyodon including several species having the pistillate flower with a complete staminodial ring.