Jacksonia spinosa (Labill.) Sm.

Scientific Description

Genus Jacksonia. Form erect. Habit shrub, spindly shrub (broom-like). Stems Indumentum glabrous, Pustules or glands absent, Striation (stems ribbed) striate, Cross section flattened, Spiny on any part of plant not spiny. Leaves or phylloclades Presence absent or apparently so (reduced to scales), Position alternate, Leaves simple (?), Leaves or phylloclade continuous with stem not 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 NaN (?). Width (entire leaves only) Leaf width NaN (?). Scale leaves length mm long 0.5-2. Indumentum Presence hairy, Type simple. Stipules Presence apparently absent even from the 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 1.2-1.5. Pedicel Presence present, Indumentum hairy. Length Pedicel length 2-3. Calyx Pustules or glands absent, Ribs ribless, Enlarged in fruit not accrescent. Length Calyx length 5-6.5. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning multicoloured, Colour (when multicoloured - choose one colour) yellow or orange, Colour (when multicoloured - choose a second colour) yellow or orange, Petal claws ( the narrow base of the petals present. Length Corolla length 5.5-7. Indumentum Presence absent. Standard Indumentum glabrous, Auricles not auriculate. Length Standard length 5-6. Wings Auricles not auriculate. Length Wing length 4-5. Keel Auricles not auriculate, Indumentum glabrous, Beak not beaked. Length Keel length 5-6. Stamens Number ten. Anthers anther length 0.3-0.4, Position at two different levels (filaments alternately long and short). Filaments Fusion free (or united at the very base). Length Filament length 3.5-4. Ovary Placement stipitate. 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 5-6. Fruit Type dehiscent (a pod or follicle), Constriction not constricted between the seeds, Compression round in cross-section. Length Fruit length NaN (?). Width Fruit width NaN (?). Indumentum Presence hairy, Indumentum type with simple hairs. Flowering time January, February, March, April, May, June, July, August, September, October, November or December. Distribution Botanical Province South-West, IBRA Bioregion Avon Wheatbelt, Jarrah Forest, Mallee, Warren, Esperance or Swan Coastal Plain.