Kadua fluviatilis
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Flowers of Kadua fluviatilis |
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Kadua fluviatilis is a plant from the genus Kadua in the family of the Rubiaceae (Rubiaceae). It is endemic to Hawaii .
description
Vegetative characteristics
Kadua fluviatilis grows as a climbing shrub whose trunks reach lengths of 0.3 to 2.5 meters. The slightly flattened stems have a round handle. The plant parts give off an unpleasant odor if they are injured.
The opposite continuously arranged on the branches leaves are in a petiole and leaf blade divided. The petiole is 0.5 to 4 inches long. The simple, stiff and paper-like leaf blade is 3.8 to 23 centimeters long and 1.6 to 6 centimeters wide from elliptical-obverse-lanceolate to elliptical-lanceolate, more rarely also broadly elliptical-reverse-lanceolate, broadly elliptical or egg-shaped. The top of the leaf blade is glabrous just like the underside. The base of the spreader tapers in a wedge shape, the more or less sickle-like curved tip of the spreader is pointed to tapered and the edge of the spreader is entire. From each side of the central leaf vein, a few pairs of side veins branch off and the higher-order leaf veins form a conspicuous, net-like pattern. The stipules resemble the deciduous leaves, are fused with the base of the petiole and thereby form a leaf sheath . The broad triangular leaf sheath is 0.5 to 0.6 centimeters.
Generative characteristics
The axillary, zymous inflorescences are reduced and stand on a 0.5 to 0.8 centimeter long inflorescence stalk, which is fused to the trunk at its base or along its entire length. The inflorescences usually contain one, rarely up to five stalked single flowers. The flower stalks are 3 to 5.5 inches long and have a square cross-section.
The four-fold flowers are radial symmetry . The square, top-shaped flower cup is about 0.3 to 0.4 millimeters long. The sepals are fused together to form a calyx tube. The calyx lobes are triangular to approximately egg-shaped with a length of 0.7 to 1.8 centimeters and a width of 0.3 to 0.6 centimeters. The fleshy and waxy, white petals are fused together like a saucer. The corolla tube reaches a length of 1.3 to 3 centimeters. The four corolla lobes reach lengths of 0.8 to 2 centimeters and have a narrow appendage at their tips. The deep bilobe stylus is hairless.
The capsule fruits have a length of 0.8 to 1.3 centimeters and a thickness of 0.9 to 1.3 centimeters wide top-shaped to top-shaped spherical and have a strongly square cross-section or a wing. The endocarp is very lignified. Each of the fruits contains several translucent, reddish-brown seeds. They are wedge-shaped and the seed coat has a net-like pattern.
Occurrence
The natural range of Kadua fluviatilis is on some islands belonging to Hawaii . Kadua fluviatilis is endemic to the islands of Kauaʻi and Oʻahu .
Taxonomy
It was first described as Kadua fluviatilis in 1912 by Charles Noyes Forbes in Occasional Papers of the Bernice Pauahi Bishop Museum of Polynesian Ethology and Natural History . Synonyms for Kadua fluviatilis C.N. Forbes are Hedyotis fluviatilis (CN Forbes) Fosberg and Kadua kamapuaana O.Deg. The specific epithet fluviatilis means something like growing in rivers .
Kadua fluviatilis seems to be closely related to Kadua acuminata and forms hybrids with this species .
Individual evidence
- ↑ a b c d e f Kadua elatior. In: Flora of the Hawaiian Islands. www.botany.si.edu/pacificislandbiodiversity/hawaiianflora, accessed on January 12, 2017 (English).
- ↑ a b Kadua fluviatilis. In: Native Plants Hawaii. www.nativeplants.hawaii.edu, accessed January 12, 2017 .
- ^ Kadua fluviatilis at Tropicos.org. Missouri Botanical Garden, St. Louis, Retrieved January 12, 2017.
- ^ Kadua acuminata. In: Native Plants Hawaii. www.nativeplants.hawaii.edu, accessed January 12, 2017 .
