Isotropis petrensis R.W.Davis & Wege
Granite Granny Bonnets

Scientific Description

Genus Isotropis. Form erect. Habit shrub, spindly shrub (broom-like). Stems Indumentum hairy, 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 not continuous with stem, Cross section of leaf or leaflet flat with flat margins, Tuberculate tubercles absent, Pustules or glands absent. Length Leaf length 20-55. Width (entire leaves only) Leaf width 3-10. Indumentum Presence hairy, Type simple. Stipules Presence apparently absent even from the youngest leaves (?), present and persistent to older leaves (?) or present but early deciduous ( only visible on youngest leaves ) (?), Glands without glands, Ribs ribless. Length Stipule length NaN (?). Bracteoles Presence present and persistent (?), absent (?) or 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 4-4.5. Calyx Pustules or glands absent, Ribs ribless, Enlarged in fruit not accrescent. Length Calyx length 10-11. Indumentum Presence hairy, Type with simple hairs. Corolla Colour patterning multicoloured, Colour (when multicoloured - choose one colour) red, Colour (when multicoloured - choose a second colour) yellow or orange, Petal claws ( the narrow base of the petals absent. Length Corolla length 12-14. Indumentum Presence absent. Standard Indumentum glabrous, Auricles not auriculate. Length Standard length 13-13.5. Wings Auricles not auriculate. Length Wing length 12-12.3. Keel Auricles not auriculate, Indumentum glabrous, Beak not beaked. Length Keel length 12.5-13. Stamens Number ten. Anthers anther length NaN (?), Position at two different levels (filaments alternately long and short). Filaments Fusion free (or united at the very base). Length Filament length NaN (?). 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 13-14. Fruit Type dehiscent (a pod or follicle) (?), indehiscent and not splitting into sections (?) or indehiscent and splitting into sections (schizocarps) (?), Constriction constricted between the seeds (?) or not constricted between the seeds (?), Compression flat or compressed (?) or round in cross-section (?), Placement stipitate (?) or sessile or subsessile (?), Beak beaked (?) or 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 July or August. Distribution Botanical Province Eremaean, IBRA Bioregion Yalgoo or Murchison.