Gastrolobium tricuspidatum Meisn.

Scientific Description

Genus Gastrolobium. Form erect. Habit shrub, spindly shrub (broom-like). Stems Indumentum hairy, Pustules or glands absent, Striation (stems ribbed) not striate, Cross section angular, Spiny on any part of plant spiny at least in part. Leaves or phylloclades Presence clearly present, Position opposite, Leaves simple, Leaves or phylloclade continuous with stem continuous with stem, Cross section of leaf or leaflet flat with flat margins, Margins of leaf or leaflet entire, Tuberculate tubercles absent, Pustules or glands absent. Length Leaf length 15-40. Width (entire leaves only) Leaf width 3-20. Scale leaves length mm long NaN (?). Indumentum Presence glabrous. Stipules Presence present and persistent to older leaves, Glands without glands, Ribs ribless. Length Stipule length 4.5-6. Bracteoles Presence present but early deciduous, Indumentum hairy (?) or glabrous (?), Striation striate (?) or not striate (?). Length Bracteole length NaN (?). Pedicel Presence present or absent (flowers sessile), Indumentum hairy. Length Pedicel length 0.7-1.2. Calyx Pustules or glands absent, Ribs ribless, Enlarged in fruit not accrescent. Length Calyx length 6.5-8.2. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning uniformly coloured, Colour (when uniformly coloured) yellow, Petal claws ( the narrow base of the petals present. Length Corolla length 9.5-12. Indumentum Presence absent. Standard Indumentum glabrous, Auricles auriculate. Length Standard length 9-9.7. Wings Auricles auriculate. Length Wing length 8.5-9. Keel Auricles auriculate, Indumentum glabrous, Beak not beaked. Length Keel length 8.4-8.7. Stamens Number ten. Anthers anther length 0.6-0.7, Position at two different levels (filaments alternately long and short). Filaments Fusion free (or united at the very base). Length Filament length 4.6-8. Ovary Placement sessile or subsessile. Indumentum Presence hairy or glandular. Style Indumentum hairy or glandular towards the base, Bearded ( with a tuft of hairs at apex ) not bearded, Apex terete. Length Style length 8.5-10. Fruit Type dehiscent (a pod or follicle), Constriction not constricted between the seeds, Compression round in cross-section, Placement stipitate, Beak not beaked. Length Fruit length NaN (?). Width Fruit width NaN (?). Indumentum Presence hairy (?) or glabrous (?), Indumentum type with simple hairs (?) or with glandular hairs (?). Flowering time September or October. Distribution Botanical Province South-West, IBRA Bioregion Avon Wheatbelt, Jarrah Forest or Mallee.