Annual or perennial herbs, usually hairy, prostrate or ascending
Leaves
opposite, petiolate, toothed or pinnately cut with segments few, narrow
Capitula
radiate; on long peduncles, solitary
Involucre
campanulate; bracts in 2 or 3 rows
Receptacle
flat or convex, paleate; paleae membranous, keeled but scarcely clasping disc florets, persistent
Ray florets
female, fertile; corolla yellow or creamy, strap-shaped
Disc florets
bisexual, fertile; corolla yellow or greenish, cylindric, 5-lobed or 5-toothed
Anthers
with bases sagittate; apical appendages narrowly deltoid
Style
branches of ray florets shortly linear-lanceolate; of disc florets much longer, acuminate with subulate appendage, hairy on outer faces
Cypselas
obconical, villous
Pappus
of many plumose bristles
x = 9 (3, 10) (polyploidy)
Nomenclature:
*Tridax
L.
Linnaeus: 900 (1753)
Linnaeus: 382 (1754)
Wild: 10 (1967)
Hilliard: 321 (1977)
Karis & Ryding: 609 (1994)
Distribution & Notes:
Global
: Species 30, Central and South America
Southern Africa
: *
Tridax procumbens
L., a pantropical weed, is occasionally found in the Northern Province, Mpumalanga, Swaziland and KwaZulu-Natal
References:
HILLIARD, O.M. 1977.
Compositae
in Natal
. University of Natal Press, Pietermaritzburg
KARIS, P.O. & RYDING, O. 1994. Tribes
Helenieae
and
Heliantheae
. In K. Bremer,
Asteraceae
, cladistics and classification
. Timber Press, Portland, Oregon
LINNAEUS, C. VON. 1753.
Species plantarum
. Laurentius Salvius, Stockholm
LINNAEUS, C. VON. 1754.
Genera plantarum
, edn 5. Laurentius Salvius, Stockholm
WILD, H. 1967. The
Compositae
of the Flora zambesiaca area, 1.
Kirkia
6
Copyright of the content hosted by this website remains with the
South African National Biodiversity Institute
(SANBI), unless stated otherwise.
Material from this site may be used in other media, provided that SANBI is acknowledged by the name
South African National Biodiversity Institute
(SANBI) or refer to the '
How to cite this resource
' paragraph on the Home page.
Liability disclaimer: Visitors use this site at their own risk and SANBI is not liable for any of the consequences resulting therefrom.
Welcome to Biodiversity Advisor 2.0!
Biodiversity Advisor, developed by the South African National Biodiversity Institute (SANBI) and its Data Partners, is a system that will provide integrated biodiversity information to a wide range of users who will have access to geospatial data, plant and animal species distribution data, ecosystem-level data, literature, images and metadata.
The integrated information comes from our much-loved Botanical Database of Southern Africa (BODATSA) also known as Plants of Southern Africa (POSA), Zoological Database of Southern Africa (ZODATSA), Biodiversity Geographic Information System (BGIS), SANBI's institutional repository (Opus) and others.
The system is still under development, so you may find a few bugs/issues. If you do, please report it via the error reporting button available in various sections of the website or provide us with any useful feedback you may have via the ‘Give us feedback’ option available in the sidebar menu. You can create a free account for yourself by clicking on the user profile icon which will take you through to the login page. Here you can choose the ‘Create an account’ option or simply fill in your details if you have an account already. Having an account on Biodiversity Advisor will provide users with free access to biodiversity resources.
In future, Team SANBI will be able to log in using their day-to-day login details, BGIS users will be able to use their existing accounts and details, and general users will be able to log in using their LinkedIn profile, but for now you will need to create an account.
