Neoachmandra

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Neoachmandra
Systematics
Nuclear eudicotyledons
Rosids
Eurosiden I
Order : Pumpkin-like (Cucurbitales)
Family : Pumpkin family (Cucurbitaceae)
Genre : Neoachmandra
Scientific name
Neoachmandra
WJde Wilde & Duyfjes

Neoachmandra is a genus of the cucurbit family (Cucurbitaceae) that is native to the tropics of the Old World .

features

The species are small, mostly annual climbing plants. They are always monocial . Pre-leaves are missing. The tendrils are simple. The leaves are simple, the veins are palmate.

The flowers are small with a diameter of around five millimeters. Their color is white. The flower stalk is slender. The sepals are very small, narrowly elliptical to linear, mostly curved backwards. The petals are free, (narrow) elliptical, the bud position is mostly valvat . The flower tube formed by the hypanthium is bell-shaped.

The male inflorescences consist of one to four (rarely up to eight) long-stalked flowers, usually one (rarely several) long-stalked female flowers also arise at the same node . There are no bracts in the inflorescence . The male flowers have a (rarely three) usually 10 to 50 millimeter long peduncle. The (rarely two) three stamens start in the upper half of the flower tube. The stamens are short, most as long as the bithekischen anthers . The connective is wide. The nectarium discus is free and almost spherical.

The female flowers are often alone or in pairs on the same node as the male inflorescence, which, however, develops earlier. The flower stalk is (rarely short) mostly long. The always bare ovary is spherical to ellipsoidal-oblong, usually with a slender neck at the top. The papillary-hairy scar consists of (rarely two) usually three lobes. Staminodes are usually present. The disc is ring-shaped and free of the flower tube.

Usually one (rarely two) fruit per plant ripens . The fruit stalk is long. The fruit is spherical, narrow ellipsoidal or elongated, 0.5 to seven centimeters long. The tip can be beaked. The surface is smooth, (pink) white to red, the inside juicy or pulpy. The pericarp is dry, membranous, or cartilaginous. The seeds are few to numerous, flat ( spherical in N. sphaerosperma ), oval-elliptical in shape, the surface slightly convex, not sculpted and with rounded edges. The base can have a short wing.

distribution

The genus is common in the tropics of the Old World: Africa, Madagascar; in Southeast Asia from India, China, Japan to Malesia , Australia and the Pacific Islands.

Systematics

The genus was first described in 2006 by WJ de Wilde and Duyfjes. Several species that were previously placed in the genera Zehneria and Melothria were assigned to it. The genus is placed in the tribe Benincaseae, Subtribus Benincasinae within the subfamily Cucurbitoideae. Her sister taxon is Zehneria .

The species found in Asia to Australia are:

literature

  • WJJO de Wilde, BEE Duyfjes: Redefinition of Zehneria and four new related genera (Cucurbitaceae), with an enumeration of the Australasian and Pacific species . Blumea, Volume 51, 2006, pp. 1-88.

Individual evidence

  1. ↑ Alexander Kocyan, Li-Bing Zhang, Hanno Schaefer, Susanne S. Renner: A multi-locus chloroplast phylogeny for the Cucurbitaceae and its implications for character evolution and classification . Molecular Phylogenetics and Evolution, Volume 44, August 2007, pp. 553-577. doi : 10.1016 / j.ympev.2006.12.022