David Lorence - Academia.edu (original) (raw)

Papers by David Lorence

Botanical sciences, Sep 14, 2015

American Fern Journal, Jul 1, 2009

Brittonia, Jul 1, 1987

The new species Chiococca grandiflora Lorence & T.Van Devender from Sinaloa and Sonora, Mexico di... more The new species Chiococca grandiflora Lorence & T.Van Devender from Sinaloa and Sonora, Mexico differs from its congeners by its larger, showy white flowers in compact cymes of 3-9, and infundibuliform corollas 16-20 mm long with tubes 13-17 mm long and lobes 3-3.5 mm long. Its distribution, habitat, and relationships are outlined. The conservation status for this species is estimated to be Endangered (EN) based on IUCN Red List Criteria. Resumen La nueva especie, Chiococca grandiflora Lorence & T.Van Devender, de Sinaloa y Sonora, México, difiere de sus congenéricas por sus grandes y vistosas flores blancas, en cimas compactas de 3-9 flores, y corolas infundibuliformes de 16-20 mm de longitud, con tubos de 13-17 mm y lóbulos de 3-3.5 mm de longitud. Se presentan datos de distribución, hábitat y relaciones. De acuerdo con los criterios de la Lista Roja de la IUCN, se estima que el estado de conservación de esta especie debe ser como En Peligro (EN, por sus siglas en Inglés).

International Journal of Plant Sciences, Sep 1, 2004

ABSTRACT A novel type of heterodichogamy in Hernandia (Hernandiaceae) and its structural basis Pe... more ABSTRACT A novel type of heterodichogamy in Hernandia (Hernandiaceae) and its structural basis Peter K. Endress1,2, David H. Lorence2 (1Institute of Systematic Botany, University of Zurich, Switzerland; 2National Tropical Botanical Garden, Kauai, Hawaii, USA) Heterodichogamy of a novel type is reported in the family Hernandiaceae (Laurales). In Hernandia nymphaeifolia, which has unisexual flowers and is monoecious, two kinds of individuals were found, one kind with female flowers open in the morning and male flowers open in the afternoon, and the other kind with the reverse behavior. The flowers, which are arranged in compound thyrses, form cymes of two male and one female flower. Developmental studies confirm an earlier interpretation of these triads as monochasia with the sequence male – male – female (Kubitzki 1969). However, the sequence of anthesis is reversed: most triads flower with the sequence male – female – male. Flower development shows that the gynoecium is unicarpellate (not pseudomonomerous). In male flowers there are three rudimentary mounds (previously overlooked) alternating with the stamens, which may correspond to those mounds in the female flowers that are united into a ring-shaped nectary and may represent extremely reduced staminodes. As heterodichogamy appears to be a rare phenomenon in angiosperms, it is of interest that heterodichogamy, although of a different type, has long been known in some Lauraceae, the sister (either alone or with Monimiaceae s.l.) of Hernandiaceae. For an evolutionary understanding, the flowering behavior of the other genera of Hernandiaceae should be studied.

Biological Conservation, Apr 1, 2002

... c, National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI 96741, USA. ... Dry fo... more ... c, National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI 96741, USA. ... Dry forests (sensu Holdridge et al., 1971) were once the most common of all tropical forest types, but today less than 0.1% of the original Pacific Mesoamerican dry forest ecosystem is protected ...

Acta Botanica Mexicana, Oct 1, 1990

Novon, 1997

Six new species of Rubiaceae from southern Mexico and Mesoamerica are described and illustrated: ... more Six new species of Rubiaceae from southern Mexico and Mesoamerica are described and illustrated: Crusea andersoniorum Lorence, Deppea miahuatlanica Lorence, Glossostipula strigosa Lorence, Hedyotis terrellii Lorence, Rondeletia evansii Lorence, and Rondeletia pringlei Lorence. One new combination is proposed, Chomelia rudis (Standley) Lorence, based on Anisomeris rudis Standley. and the new name Psychotria molinarum Lorence is proposed based on Evea chiapensis Standley. During the course of preparing the Rubiaceae treatment for Flora Mesoamericana, collections representing undescribed taxa in various genera from Mesoamerica and southern Mexico were en¬ countered. A number of these specimens were collected during field explorations of botanically poorly known areas for the Flora Mesoamericana , Flora of Chiapas, and Flora de Oaxaca projects. Six new species are described and illustrated and their affinities discussed. In addition, one new combination is made and one new name is pro¬ posed. The taxa are arranged here alphabetically by tribe and within each tribe following Andersson (1992). A complete account of the Mesoamerican Rubiaceae will be given in the forth¬ coming treatment for Flora Mesoamericana by D.

Taxon, Nov 1, 2003

... Systematique et Evolution USM 0602, Herbier Plantes Vasculaires, Museum National d'Histo... more ... Systematique et Evolution USM 0602, Herbier Plantes Vasculaires, Museum National d'Histoire Naturelle, 16 rue Buffon, 75005 Paris ... sexuale diges-tas - Editio quarta, post Reichardianam quinta adjectis vegetabilibus hucusque cognitis, curante Carolo Ludovico Willdenow, ed ...

Geography, Environment, Sustainability, 2017

A complex cladistic analysis of molecular and morphological data of the Monimiaceae family is car... more A complex cladistic analysis of molecular and morphological data of the Monimiaceae family is carried out. The hypothetic modes of the family dispersal are reconstructed basing on the data received for the studied representatives of the Monimiaceae family from all parts of the range and available fossils data. The family supposedly originated in Africa and penetrated into South America via the Antarctic way, and through the

Anales del Instituto de Biología. UNAM. Serie botánica, 1983

Acta Botanica Mexicana, Jul 1, 2009

the name Didymaea alsinoides (Schltdl. & cham.) Standl. has been incorrectly applied to a common ... more the name Didymaea alsinoides (Schltdl. & cham.) Standl. has been incorrectly applied to a common and wide-ranging mexican and central american species whose correct identity is Didymaea mexicana Hook. f. in this paper a lectotype is selected and designated for D. mexicana. the characters separating these two frequently confused species are discussed. further systematic studies of the genus Didymaea are suggested.

... Consequently, the present state of the vegetation of the Marquesas is a result of all these f... more ... Consequently, the present state of the vegetation of the Marquesas is a result of all these factors (Decker, 1970, 1992). GENERAL CHARACTERISTICS OF THE FLORA The principal elements governing biological diversity and vegetation types in the Marquesas are distance ...

University of Hawaii Press eBooks, Dec 31, 2017