Indigofera rivularis Peter G.Wilson

Scientific Description

Genus Indigofera. Form erect. Habit shrub, spindly shrub (broom-like). Stems Indumentum hairy, Pustules or glands absent, Striation (stems ribbed) not striate, Cross section terete, 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 flat margins, Margins of leaf or leaflet entire, Tuberculate tubercles absent, Pustules or glands absent. Length Leaf length 25-60. Width (entire leaves only) Leaf width 9-25. Scale leaves length mm long NaN (?). Indumentum Presence hairy, Type simple. Stipules Presence present and persistent to older leaves, Glands with glands (?) or without glands (?), Ribs ribbed (?) or ribless (?). Length Stipule length NaN (?). Bracteoles Presence present but early deciduous, Indumentum hairy (?) or glabrous (?), Striation striate (?) or not striate (?). Length Bracteole length NaN (?). Pedicel Presence present, Indumentum hairy. Length Pedicel length 3-4. Calyx Pustules or glands absent, Ribs ribless, Enlarged in fruit not accrescent. Length Calyx length 2-3.3. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning multicoloured, Colour (when multicoloured - choose one colour) pink or white, Colour (when multicoloured - choose a second colour) pink or white, Petal claws ( the narrow base of the petals present. Length Corolla length 7-9.5. Indumentum Presence present. Standard Indumentum hairy at least in part, Auricles not auriculate. Length Standard length 7-8.5. Wings Auricles not auriculate. Length Wing length 6-7.5. Keel Auricles not auriculate, Indumentum hairy at least in part, Beak not beaked. Length Keel length 7-9. Stamens Number ten. Anthers anther length 0.6-1, Position at two different levels (filaments alternately long and short). Filaments Fusion united in an open sheath with one free stamen. Length Filament length 7-8.2. Ovary Placement stipitate. Indumentum Presence hairy or glandular. Style Indumentum hairy or glandular towards the base, Bearded ( with a tuft of hairs at apex ) bearded (with a tuft of hairs at apex), Apex terete. Length Style length 6.5-10.4. Fruit Type dehiscent (a pod or follicle), Constriction not constricted between the seeds, Compression round in cross-section, Placement sessile or subsessile, Beak not beaked. Length Fruit length 20-30. Width Fruit width 2-3. Indumentum Presence hairy, Indumentum type with simple hairs. Flowering time May, June or July. Distribution Botanical Province Eremaean, IBRA Bioregion Pilbara. Conservation Code Priority Three (P3).