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Key message In sexually plastic Acer pensylvanicum, determination of sex can occur extremely late, within three weeks of spring flowering. Physical damage causing complete vascular tissue severance results in increased female expression. Abstract Species with environmental sex determination are rare amongst angiosperms but widely distributed across taxa. The timing of floral development in species...
Terrestrial dioecious shrubs or small trees, much branched, partially pubescent. Leaves (sub)opposite, simple, ovate-oblong, obtuse, short-petiolate, without stipules. Inflorescence subtended by two leaves, axillary, in 1–7-flowered congested racemes or dichasia, often reduced to only 1–2 flowers. Flowers bisexual, but functionally unisexual, hypogynous, 5(6)-merous; corolla sympetalous, imbricate...
Artemisia dracunculus (wild or Russian tarragon), is a polymorphic, herbaceous perennial with a widespread distribution that spans western North America, Eastern Europe and most temperate of Asia. This wild relative of the culinary herb French tarragon has recently been the focus of a number of studies which have investigated its medicinal activity in type 2 diabetes bioassays. The species is documented...
We examined the genetic population structure of Spartina alterniflora in Jamaica Bay, Queens, NY and the surrounding area in order to assist the ongoing restoration of Jamaica Bay. AMOVA (Analysis of Molecular Variance) indicated that population differences accounted for 15% of molecular variance (ΦPT = 0.15, p = 0.001). Observed heterozygosity (Ho) ranged from 0.61 to 0.73 among populations. A Mantel...
Summary A morphology-based phylogeny and taxonomic revision of Prepusa Mart. and Senaea Taub. are presented. Based on studies of herbarium collections, five species of Prepusa and two species of Senaea are recognised. All are endemic to montane habitats in the Brazilian states of Bahia, Espírito Santo, Minas Gerais and Rio de Janeiro. Morphological descriptions, identification keys, illustrations...
A cladistic analysis of the saprophytic genus Voyria Aubl. (Gentianaceae) was performed to evaluate infrageneric classification, character evolution, and biogeography. A matrix of 19 species of Voyria and 39 morphological characters yielded three most-parsimonious trees, one of which was identical to their strict consensus. The major division within Voyria based on character support is also the rooting...
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