Skip to main content

Service Notice

The Western Australian Herbarium’s collections management system and census were set to read-only mode on 1 October 2025. Taxonomic updates published since this time are not being reflected in Florabase, herbarium collections, or Western Australia’s taxonomic names census (Nomos). Conservation listings displayed on Florabase may also be out of date. Please refer to DBCA’s Threatened species and communities webpage for the most recent Threatened and Priority Flora List, noting that recent taxonomic updates are similarly not included. Our database migration is moving to a staging phase. We thank you for your patience as we ensure the integrity of our biodiversity data, develop new workflows, and train staff to use the new systems. Please reach out to us if you have any questions or concerns.

The notice period started at 12:00 pm on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Friday, 1 January 2027 +08:00.

Advanced Search

Dimorphocalyx Thwaites

This name is not current. Find out more information on related names.

Reference
Enum.Pl.Zeyl. 278 (1861)
Name Status
Not Current

Scientific Description

Family Euphorbiaceae.

Habit and leaf form. Trees; laticiferous (latex non-toxic). Plants succulent, or non-succulent. Mesophytic, or xerophytic. Leaves medium-sized to large; alternate; spiral, or distichous; ‘herbaceous’, or leathery, or fleshy; petiolate; non-sheathing; gland-dotted, or not gland-dotted; simple. Leaf blades entire; pinnately veined. Leaves with stipules. Stipules scaly, or leafy; caducous. Leaves without a persistent basal meristem. Leaf anatomy. Urticating hairs present, or absent. Stem anatomy. Nodes tri-lacunar, or unilacunar. Secondary thickening developing from a conventional cambial ring, or anomalous; from a single cambial ring.

Reproductive type, pollination. Fertile flowers functionally male, or functionally female. Unisexual flowers present. Plants dioecious, or monoecious (rarely). Female flowers aggregated in ‘inflorescences’, or solitary (sometimes). Male flowers aggregated in ‘inflorescences’; without pistillodes. Entomophilous.

Inflorescence and flower features. Flowers aggregated in ‘inflorescences’, or solitary; in cymes, or in racemes. Inflorescences axillary. Flowers bracteate, or ebracteate; minute to small; regular. Floral receptacle developing an androphore, or with neither androphore nor gynophore (? depending on interpretation). Free hypanthium absent. Hypogynous disk present; annular. Perianth with distinct calyx and corolla; 10; 2 -whorled; isomerous. Calyx 5; 1 -whorled; gamosepalous (lobed or cupular in male flowers; almost free in female flowers); regular; accrescent. Corolla 5; polypetalous; regular; glabrous abaxially; glabrous adaxially. Fertile stamens present, or absent (female flowers). Androecium 7–20. Androecial members branched, or unbranched; free of the perianth; free of one another (if filaments interpreted as arising from an androphore), or coherent (the outermost filaments partly connate and the innermost almost completely connate into a column). Androecium exclusively of fertile stamens. Stamens 7–20; diplostemonous to polystemonous; erect in bud, or inflexed in bud. Anthers dorsifixed; dehiscing via longitudinal slits; extrorse, or introrse; bisporangiate, or tetrasporangiate. Fertile gynoecium present, or absent (male flowers). Gynoecium 3 carpelled. The pistil 3 celled. Gynoecium syncarpous; synovarious, or synstylovarious; superior. Ovary plurilocular; 3 locular. Styles 3; free, or partially joined; forked; apical. Stigmas 6; dry type; papillate, or non-papillate; Group II type. Placentation axile, or apical. Ovules 1 per locule; pendulous; epitropous; with ventral raphe, or with dorsal raphe; non-arillate; anatropous.

Fruit and seed features. Fruit non-fleshy; a schizocarp (capsular). Mericarps crustaceous, 2-valved. Fruit elastically dehiscent (schizocarpic capsules often splitting elastically), or passively dehiscent. Seeds 1 per mericarp. Seeds ovoid; endospermic. Endosperm oily. Cotyledons 2 (usually wider than the radicle). Embryo straight, or curved. Seedling. Germination phanerocotylar, or cryptocotylar.

Physiology, biochemistry. Mustard-oils present, or absent.

Geography, cytology, number of species. Native of Australia. Not endemic to Australia. Australian states and territories: Western Australia, Queensland, and New South Wales. Northern Botanical Province.