Englera 17
Abstract
- Kilian, N.: Revision of Launaea Cass. (Compositae,
Lactuceae, Sonchinae). – Englera 17: 1-478. 1997.
– ISBN 3-921800-41-2.
- The first taxonomic revision of the entire genus
Launaea, which is chiefly distributed in Africa and
SW Asia, is provided. 54 species with 10 subspecies, grouped
in eight sections, are recognized. Three sections, i.e.
L. sect. Castanospermae, Cervicornes,
and Cornutae, seven species, i.e. L. almahrahensis,
L. amal-aminae, L. angolensis, L. lackii,
L. omanensis, L. quettaensis, and L. socotrana,
as well as one subspecies, L. fragilis subsp.
asirensis, are described as new to science, and the
combinations L. acanthodes subsp. tomentella,
L. cabrae, L. cabrae subsp. nanella,
L. petitiana, L. polydichotoma, and L.
pseudoabyssinica are formed as names new to science.
General parts deal with the history, distribution, taxonomic
position and delimitation of the genus, as well as with
its morphology (including pericarp anatomy). Illustrations,
keys to all taxa recognized, full synonymies, references
to further illustrations, descriptions, chromosome numbers,
data on the ecogeography including geographical distribution
maps, lists of the specimens studied, and data on the use
of the species are provided. The chromosome numbers of
L. benadirensis (2n = 16) and L. petitiana
(2n = 18, 36, 54) are reported for the first time, the latter
being the first report of a hexaploid cytotype for the genus.
A new chromosome number for L. cornuta (2n = 10)
is reported, prolonging the series of consecutive basic
numbers known in the genus from x = 9 down to x = 5. Indexes
to the scientific names referring to the genus, to the geographical
distribution of the species, and to the revised collections
are provided.
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- Erratum
- The adjectival epithet commemorating Cassini has consistently
been misspelled as "cassiana" and has to be corrected
in the combination Launaea mucronata subsp. cassiniana
and all corresponding combinations based on Sonchus cassinianus
Jaub. & Spach.
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