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The Cutting Edge
Volume IX, Number 3, July 2002
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HIPPOCASTANACEAE. J. Fco. Morales (INB).
Well, not exactly. Chico has chosen to follow the Angiosperm Phylogeny Group
The Cutting Edge 6(1): 5–6, Jan. 1999], not to mention common sense, in including
this taxon in Sapindaceae, so this is really a supplement to his already completed
treatment of the latter family [see
Edge 7(1): 3–4, Jan. 2000]. In a further audacious departure from tradition,
he tentatively opts to accept just one sp. of Billia, the only genus occurring in
Costa Rica. This decision renders moot the recent substitution of the name
Billia rosea (Planch. & Linden) C. Ulloa & P. M.
JØrg. for the long-entrenched
B. columbiana Planch. & Linden [see
Edge 8(3): 10–11, Jul. 2001], as both now become synonyms of B. hippocastanum
Peyr. Chico's new taxonomy is based on his field observations suggesting that the
characters that have been used to distinguish two spp. vary independently. He
considers that additional herbarium corroboration of this hypothesis is needed.
ONAGRACEAE. J. González (INB).
Six genera occur in Costa Rica, with a total of 30 spp., none of which is endemic.
By far the most sp.-rich genus is Ludwigia, with 17 Costa Rican members,
followed distantly by Fuchsia and Oenothera, with five apiece.
No cultivated spp. are treated formally (though several are mentioned under the
latter two genera), and no spp. are included hypothetically or under provisional
SABIACEAE. J. Fco. Morales (INB).
This is not a de novo contribution, but rather an augmentation of Chico's previously
submitted treatment of this small family [see
Edge 5(4): 3, Oct. 1998]. The Costa Rican sp. total for Meliosma (the
sole Mesoamerican genus in the family) rises from 12 to 14 with the addition of
Meliosma cordata A. H. Gentry and M. occidentalis Cuatrec. [the
latter segregated from Costa Rican matierial generally identified as M. vernicosa
(Liebm.) Griseb.]. The other details in our initial report remain unchanged, except
that one of the then (and still) unpublished spp. has apparently undergone an embryonic
THEOPHRASTACEAE. J. Fco. Morales (INB).TOP
No surprises here, among the three genera and four spp. of Theophrastaceae represented
in Costa Rica. The genus with two spp. is Clavija. Our sole endemic sp. is
the recently described Deherainia lageniformis Gómez-Laur. & N. Zamora
[see The Cutting
Edge 5(4): 6, Oct. 1998].