J. Black, Trans. R.Soc. S. Aust. 40:00 (1916).
Synonymy: Not Applicable
Common name: Three-petal poranthera.
Dwarf slender compact ascending glabrous annual; stems few to several, filiform, 1-2 rarely 3-4 cm long; leaves green, seldom red-marked, mostly opposite, obovate to spathulate, attenuate into indistinct petioles, lamina 2-7 x 0.5-3 mm, generally flat; stipules narrow-triangular, nearly filiform, 0.5-0.8 mm long, white-leathery, sometimes tinted red; monoecious.
Flowers on distinct pedicels 0.5-2.5 mm long, subtended by a smaller leaf longer or shorter than the flower, few in corymbs on filiform peduncles 2-10 mm long, shorter or longer than the supporting leaf; calyx segments mostly 3, ovate, c. 1.5 mm long, white, sometimes red-marked; stamens 3, the filaments half the length of the segments; anthers semiglobular, yellow, c. 0.15 mm across; rudimentary ovary minute, globular, glandlike; in female flowers occasionally 4 calyx segments present, the fourth being slightly smaller, hardly c. 1 mm long; ovary at anthesis c. 0.5 mm across, green; styles 3, short, obtuse, thick, merely notched at the summit, red-brown.
Capsule depressed-globular, 1-1.5 mm across, distinctly 3-6-lobed or indistinctly green-yellow, sometimes tinted brown, 6-seeded; seed wedge-shaped reniform, dorsally globular, c. 0.5 mm long, light-brown and smooth or often white-powdered or white-granulate-tuberculate.
||Poranthera triandra habit, male flower and stamen, side and ventral view of female flower, fruit and seed, and embryo.
Image source: fig 408 in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).|
S.Aust.: EP, NL, MU, YP, SL, KI, SE.
Flowering time: Aug. — Nov.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
As in P. microphylla the male flowers after anthesis are deciduous and in later stages the plant bears only female floral parts.
Resembles P. microphylla which is usually a larger plant in which some flowers have 4 calyx segments but the male flowers always have 5 stamens and female have 3 styles distinctly cleft into 6 white segments with brown tips only.
Not yet available