Mirbelia sp. hooked keel (M.D. Crisp 8519 & W. Keys)

Scientific Description

Genus Mirbelia. Form erect. Habit shrub, spindly shrub (broom-like). Stems Indumentum hairy, Pustules or glands absent, Striation (stems ribbed) striate, Cross section angular, Spiny on any part of plant not spiny. Leaves or phylloclades Presence clearly present, Position alternate, Leaves simple, Leaves or phylloclade continuous with stem continuous with stem, Cross section of leaf or leaflet flat with recurved margins, Margins of leaf or leaflet entire, Tuberculate tubercles absent, Pustules or glands absent. Length Leaf length 3-9. Width (entire leaves only) Leaf width 0.8-1. Scale leaves length mm long NaN (?). Indumentum Presence hairy, Type simple. Stipules Presence present but early deciduous ( only visible on youngest leaves ), Glands with glands (?) or without glands (?), Ribs ribbed (?) or ribless (?). Length Stipule length NaN (?). Bracteoles Presence present and persistent, Indumentum hairy, Striation not striate. Length Bracteole length 1-4. Pedicel Presence present, Indumentum hairy. Length Pedicel length 2.5-3. Calyx Pustules or glands absent, Ribs ribless, Enlarged in fruit not accrescent. Length Calyx length 6.5-8. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning multicoloured, Colour (when multicoloured - choose one colour) yellow or brown, Colour (when multicoloured - choose a second colour) yellow or brown, Petal claws ( the narrow base of the petals absent. Length Corolla length 12.5-13. Indumentum Presence absent. Standard Indumentum glabrous, Auricles not auriculate. Length Standard length 11.5-13. Wings Auricles not auriculate. Length Wing length 9-10.5. Keel Auricles not auriculate, Indumentum glabrous, Beak not beaked. Length Keel length 8.5-10. Stamens Number ten. Anthers anther length 0.4-0.5, Position at two different levels (filaments alternately long and short). Filaments Fusion free (or united at the very base). Length Filament length 3-5. Ovary Placement stipitate (?) or 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 2.6-3. 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 Mallee or Esperance.