Hanguanaceae Airy Shaw
  • Airy Shaw, Kew Bull. 18: 260 (1965)


This taxon is accepted by WCS higher taxonomy

General Description

Perennial, dioecious herbs, when young covered with short branched hairs; aerial shoots ascending to erect, solid, terete; stolons creeping, sometimes floating, encircled by appressed, disintegrating leaf sheaths (Hanguana malayana) or plants clump-forming with the young shoots directly on the old stem. Leaves spiralled, with linear to lanceolate blades, at least lower ones long-petioled, the base forming an open, stem-clasping sheath; venation of the blade pinnate-parallel, with tesselate venules; ptyxis supervolute. Inflorescence terminal, paniculate or sometimes whorled, composed of spikelike partial inflorescences. Flowers sub-sessile, actinomorphic, trimerous, hypogynous. Tepals bractlike, pale yellowish or greenish, sometimes red-dotted, persistent, shortly connate at base, arranged in 2 whorls, the outer smaller than the inner, hood-shaped ones. Staminate flowers with rudimentary ovary which is surrounded by a 6-lobed, disklike structure; stamens 6, about as long as inner tepals or longer; filaments filiform with broader base, inserted on the perianth base; anthers with short connective, basifixed, introrse, tetrasporangiate, longitudinally dehiscent. Pistillate flowers with 6 staminodes, the inner minute; ovary ovoid-globose, 3-locular with axile placentation; style very short or stigma sessile, deeply divided into 3 short, spreading lobes; ovules solitary in each locule, almost atropous, with funicular obturator. Fruit a 1(-3)-seeded berry; seed bowl-shaped, arching over the globose placenta; seed coat sclerified; endospermcopious, starchy, embryo small.

A monogeneric family with probably five or more species from tropical SE Asia, Micronesia and Australia.

Ecology

The plants grow along rivers and lakes or in lowland swamps and humid forests up to 1500 m, or in freshwater, sometimes forming floating islands. In some morasses, H. malayana suppresses all other plants except for some orchids (Backer 1951).

Distribution

Hanguana ranges from Sri Lanka to SE Asia, Micronesia (Palau) and N Australia.

Uses

According to Maury 1888, the roots of Susum anthelminthicum Blume, the aquatic form of H. malayana, have been used as a vermifuge in veterinary medicine. However, this use has never been confirmed according to Backer 1951, who reported that raw stems and runners of this form are said to be edible.

Included Genus

  Bibliography

  • 1 Bayer, C., Appel, O. & Rudall, P.J. Hanguanaceae. Flowering Plants. Monocotyledons: Alismatanae and Commelinanae (except Gramineae) 223-225 (1998).
  • 2 Airy Shaw, H.K. Original publication of Hanguanaceae. (1965).

 Information From

WCS higher taxonomy
  • A All Rights Reserved
  • B

    With kind permission from Springer Science+Business Media: This work is subject to copyright. All rights reserved, whether whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, broadcasting reproduction on microfilm or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer-Verlag. Violations are liable for prosecution under German Copyright Law.

    All Rights Reserved
World Checklist of Selected Plant Families
http://apps.kew.org/wcsp/
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
  • C See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement.