Tasmannia R.Br. ex DC.

First published in Syst. Nat. 1: 445 (1817)
This genus is accepted
The native range of this genus is Malesia to Papuasia, E. & SE. Australia.

Descriptions

Timothy M. A. Utteridge and Laura V. S. Jennings (2022). Trees of New Guinea. Kew Publishing. Royal Botanic Gardens, Kew

Distribution
A genus of c. six species with many ‘entitites’, or of up to 50 species depending on species concept, in the Old World from Malesia through to the Pacific islands. The genus has been traditionally included in a larger Drimys R.Br. but divided into two sections with sect. Tasmannia in the Old World with unisexual flowers (plants usually dioecious) and sect. Drimys in the New World with bisexual flowers. Molecular evidence suggests that the two groups are not monophyletic and the recent Flora of Australia, as well as the Mount Jaya checklist (Johns et al. 2006), recognised Tasmannia rather than Drimys. Tasmannia is found in a range of primary and secondary habitats including lowland rain forest, montane forests, subalpine grasslands and shrubberies from 500 to c. 4200 m elevation. The genus can be recognised by the spirally arranged, simple leaves, the monopodial growth habit and a flower with a protective calyptra that is shed just prior to anthesis.
Morphology General Habit
Shrubs or small trees to 15 m; branching monopodially after flowering
Morphology Leaves
Leaves alternate or subopposite, usually pseudo-whorled, with a spicy or peppery scent when crushed
Morphology Reproductive morphology Inflorescences
Inflorescences pseudo-terminal and umbel-like below a dormant vegetative bud, 1–16-flowered with flowers single in axils of caducous bracts
Morphology Reproductive morphology Flowers
Flowers functionally unisexual (plants dioecious); calyx calyptrate, enclosing bud until anthesis, often rupturing laterally into 2 or 3 lobes and then falling; petals 1–9 or absent, 1-seriate, free, usually white, cream or yellow but sometimes pink; staminate flowers with fertile stamens 6–98, 2–4-seriate, anthers and filaments distinct; staminodes absent in pistillate flowers; pistillate flowers with fertile carpels 1–11(–18), free, stigma extending over adaxial side and slightly over apex of carpel, ovules 2–36 per carpel; staminate flowers with sterile carpels 1–5 (rarely absent)
Morphology Reproductive morphology Fruits
Fruit apocarpous, monocarps berry-like
Morphology Reproductive morphology Seeds
Seeds 1–27 per monocarp, laterally flattened, slightly to strongly curved, black.
[TONG]

Sources

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Trees of New Guinea

    • Trees of New Guinea
    • http://creativecommons.org/licenses/by-nc-sa/3.0