bracteole


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Related to bracteole: involucre

bracteole

a small BRACT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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The bracteole of pistillate flowers has a single-layered epidermis (see Figure 4A, B).
Chasmogamous flowers borne in pairs at tips of vegetative stems; bract subtending each flower like a vegetative leaf but generally smaller, 4-9 mm long, 1.5-2 mm wide; peduncle 3-10 mm long, shorter in flowers, elongating as fruits mature; bracteoles borne at or slightly below apex of peduncle, spreading, resembling miniature leaves 1.5-3 mm long, 0.8-1.5 mm wide, ovate, deciduous in fruit; pedicel 3-7 mm long, shorter in flowers, elongating as fruits mature; cleistogamous flowers not found.
Numerical values were assigned to the following categorical traits: leaf shape (0 = chordate, 1 = ovate, 2 = rhombohedric and 3 = hastate), flower pigmentation (0 = white, 1 = lavender), base of standard (0 = striped and i = smooth), bracteole size (0 = small, 1 = medium, 2 = large), bracteole shape (0 = cordate, 1 = lanceolate, 2 = ovate and 3 = triangular), and pod beak position (1 = central, 2 = placental).
Amaranthaceae are characterized by having solitary flowers, cymose or variously compound (modified cymose) inflorescences, often subtended by bracts or bracteoles (Cronquist, 1981; Kadereit et al., 2003).
Some of these characters, including inflorescence position and "winter" development, bracteole position, indumentum of the corolla and filaments, anther texture, presence and positioning of staminal appendages (spurs, awns, tubules, etc.), and fruit dehiscence and texture (leading to various fruit types), are extremely homoplasious.
For measurement of leaf, pod, and bracteole characteristics, a central leaflet from a fully developed trifoliate leaf, hilly open flowers, and fully developed pods were used, respectively (Singh et al., 1991a).
2-4 cm diam., peduncle 4.5-9 cm long; fruits rounded shape with persistent calyx, reticulate ornamentation, 3-5 fruits per peduncle, light greenish yellow with persistent bracteoles at the base, fruity smell.
Involucre caliculate with 1-3 bracteoles, phyllaries 5-7.
The species of Senna can be identified morphologically by the absence of bracteoles on the flower pedicel, the presence of claviform to pyramidal convex extrafloralnectaries, and cylindrical or flat-compressed fruit with inert dehiscence.