Swainsona pterostylis (DC.) Bakh.f.

Scientific Description

Genus Swainsona. Form erect or prostrate,spreading or scrambling. Habit herb. 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 compound, 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 50-115. Width (entire leaves only) Leaf width NaN (?). Scale leaves length mm long NaN (?). Leaflets Number more than three, Number of leaflets (if more than three) 13-19, Arrangement pinnately arranged. Terminal leaflet Presence present, Stalk stalked. 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 and persistent, Indumentum hairy, Striation not striate. Length Bracteole length 1-1.2. 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 4.5-5.5. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning uniformly coloured, Colour (when uniformly coloured) purple, Petal claws ( the narrow base of the petals present. Length Corolla length 9-13.5. Indumentum Presence absent. Standard Indumentum glabrous, Auricles not auriculate. Length Standard length 7-13. Wings Auricles auriculate. Length Wing length 6-9. Keel Auricles auriculate, Indumentum glabrous, Beak not beaked. Length Keel length 8-10. Stamens Number ten. Anthers anther length 0.5-0.7, Position at two different levels (filaments alternately long and short). Filaments Fusion united in an open sheath with one free stamen. Length Filament length 6-8. 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 flattened at apex. Length Style length 10-14. Fruit Type dehiscent (a pod or follicle), Constriction not constricted between the seeds, Compression round in cross-section, Placement stipitate. Length Fruit length 10-12. Width Fruit width 6-7. Indumentum Presence glabrous. Flowering time April, May, June, July, August, September or October. Distribution Botanical Province Northern, Eremaean or South-West, IBRA Bioregion Great Sandy Desert, Pilbara, Carnarvon, Gascoyne, Yalgoo, Murchison, Dampierland, Geraldton Sandplains or Avon Wheatbelt.