Convolvulus angustissimus subsp. angustissimus
Nomenclature
Convolvulus angustissimus R. Br. subsp. angustissimus
Convolvulus adscendens de Vriese in Lehmann, Plantae Preissianae 1: 346 (1845). Type: In arenosis apertis distr. York, 16 March 1839, Herb. Preiss No. 1924 (holotype LD; isotypes MEL [MEL689918, MEL689919]).
Convolvulus subpinnatifidus de Vreise in Lehmann, Plantae Preissianae 1: 347 (1845). Type: In solo sublimoso fertili prope Beljarup, Hay, 4 November 1840, Herb. Preiss No. 1925 (holotype LD; isotypes MEL [MEL689916, MEL689917]).
Convolvulus acaulis Choisy in DC. Prodr. 9: 406. (1845). Type: Nova Hollandia (ins. Kanguroos) (holotype P).
Description
Johnson, R.W. 2001. A taxonomic revision of Convolvulus L. (Convolvulaceae) in Australia. Austrobaileya 6: 1–39.
Biogeography, Ecology and Natural History
Australia (Western Australia, South Australia, Queensland, New South Wales, Tasmania). Endemic.
It
is found on level to hilly terrain in mainly loamy and clay soils, less
commonly in sandy and rocky soils. It grows in grassy Eucalypt woodlands and
forests and in grasslands which develop following the clearing of the
woodlands.
flowering occurs mainly in early spring to mid autumn (September-April) while fuiting occurs from late spring to late autumn (November-May).
Johnson, R.W. 2001. A taxonomic revision of Convolvulus L. (Convolvulaceae) in Australia. Austrobaileya 6: 1–39.
As circumscribed here, considerable variation exists within this subspecies. The typical form with large Flowers and long pedicels is found in Tasmania and southern Victoria and extends into south-eastern South Australia and north into New South Wales. In drier parts of Victoria on through South Australia to Western Australia there is a gradual reduction in the size of the corolla with petals on most specimens rarely exceeding 14 mm in length.
In Queensland, a variant with moderately dense ascending to erect hairs up to 0.75 mm long is found in the Charleville district (Clements AQ275818, Bailey AQ275821). This variant has black Seeds, 4.5-5 mm long, which are larger than those from other populations. In addition the surface ridges on the Seeds are more distinctly raised and the discontinuous wing more prominent. Both are formed by fused hair-like structures. No collections have been made of this population since 1945 and the study of further material may warrant its recognition as a distinct taxon.