For Watson and Dallwitz (1992-), a staminode
is a sterile stamen, or a modified structure identifiable as such, borne in the androecial region of the flower.
Commonly the odd stamen is more or less reduced to a staminode
or even lacking.
Pollination by deceit in Paphiopedilum barbigerum (Orchidaceae): a staminode
exploits the innate colour preferences of hoverflies (Syrphidae).
In Heliconia, a single stamen develops as an infertile, often callose, staminode
(Kirchoff et al.
The adaxial and abaxial stamen pairs show various degrees of asymmetry; either pair can be missing entirely or develop only as staminodes
, or there may be a fifth stamen or staminode
present in the adaxial median position.
Florets dimorphic; marginal florets female with staminodes
, corollas bilabiate, outer lip expanded; central florets bisexual, corolla actinomorphic, tubular-funnelform, deeply five-lobed; anther apical appendages apiculate, tails papillose; style bilobed, branches dorsally smooth.
Florets dimorphic; marginal florets female, with well developed staminodes
, corolla bilabiate, with an expanded outer lip; central florets bisexual, corolla bilabiate; anther apical appendages acute, tails papillose; style bilobed, branches dorsally papillose.
2 mm in diameter, glabrous, stigma branches three, white, linear, 1-2 mm long, recurved; staminodes
white, laminar, triangular, ca.
presence of staminodes
, short and long stamens) that are found in some floral formulae cannot be recorded.
Fully hardy and into flower around mid April, the nodding, long, 3 in petals are snow white with yellow-tipped white staminodes
(the brush like stamens in the centre).
The petals are actually white, with prominent yellow staminodes
3 mm long; staminodes
six, rose-colored, laminar at the base, linear-triangular, ca.