Kadua acuminata
| Kadua acuminata | ||||||||||||
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Kadua acuminata |
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| Kadua acuminata | ||||||||||||
| Cham. & Schltdl. |
Kadua acuminata is a plant from the genus Kadua in the family of the Rubiaceae (Rubiaceae). It is endemic to Hawaii .
description
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Vegetative characteristics
Kadua acuminata grows as a shrub or shrub . The climbing or curved shoots are 2 to 4 meters long, have a cylindrical to square cross-section and are occasionally slightly winged. The 0.1 to 1 meter long branches are hairless. The plant parts give off an unpleasant odor if they are injured.
The constantly against arranged on the branches leaves are divided into a petiole and leaf blade. The bald or finely hairy petiole is 0.4 to 4.5 inches long. The simple, paper-like to slightly leathery leaf blade is 5 to 18 centimeters long and 1.6 to 8 centimeters wide, from lanceolate to ovoid and elliptical to elliptical-ovoid, occasionally also elliptical-obovate. The underside of the leaf blade is glabrous or finely hairy , especially along the leaf veins . The base of the spade is rounded to wedge-shaped and the tip of the spreader is pointed to elongated, sometimes also tapered. Several inconspicuous to noticeable side veins branch off from each side of the central leaf vein.
The bald or, more rarely, sparsely hairy stipules resemble the leaves, are fused with the base of the petiole and thus form a leaf sheath with a pointed tip. The broadly triangular leaf sheath is 1.5 to 9 millimeters long.
Generative characteristics
The reduced, zymous inflorescences are axillary. The inflorescence stalk is 0.1 to 1.7 centimeters long and is fused with the stem axis at the base or along its entire length. The inflorescences usually contain one, rarely up to seven individual flowers. The flowers stand on, in cross-section square pedicels, which are 0.5 to 3.5 centimeters long.
The four-fold flowers are radial symmetry . The top-shaped flower cup is 1.5 to 4 millimeters and has a more or less square cross-section. The sepals are fused together to form a calyx tube. With a length of 0.5 to 1.5 centimeters and a width of 0.15 to 1 centimeter, the calyx lobes are approximately lanceolate to approximately ovoid, sometimes also broadly ovate. The not or only slightly fleshy, yellowish green, more rarely also green to greenish white petals are fused together in the shape of a salver. The corolla tube reaches a length of 0.7 to 1.8 centimeters and is usually hairless. The four, mostly bent back, corolla lobes reach lengths of 0.4 to 1.1 centimeters and have a narrow appendage at the tip. The stamens are inserted in the upper part of the corolla tube. The most hairy, rarely bald pen is deeply lobed twice.
The woody capsule fruits have a length of 0.6 to 1.2 centimeters and a thickness of 0.5 to 1 centimeter wide and are circular to spherical-top-shaped and can have a wing. The tip of the capsule fruits is divided into several segments. Each of the fruits contains several reddish seeds. They are wedge-shaped and the seed coat has a fine net-like structure.
distribution
The natural range of Kadua acuminata is on some islands belonging to Hawaii . Kadua acuminata is endemic to the islands of Hawaiʻi , Kauaʻi , Lānaʻi , Maui Molokaʻi and Oʻahu .
Kadua acuminata thrives at altitudes of 295 to 2625 meters. The species grows there in moderately moist to moist forests.
Taxonomy
It was first described as Kadua acuminata in 1829 by Adelbert von Chamisso and Diederich Franz Leonhard von Schlechtendal in Linnaea . The specific epithet acuminata means something with a long tip or pointed and refers to the elongated, pointed leaves of the species.
Kadua acuminata seems to be closely related to Kadua fluviatilis and forms hybrids with this species .
Individual evidence
- ↑ a b c d e f Kadua acuminata. In: Flora of the Hawaiian Islands. www.botany.si.edu/pacificislandbiodiversity/hawaiianflora, accessed on December 22, 2016 (English).
- ↑ a b c Kadua acuminata. In: Native Plants Hawaii. www.nativeplants.hawaii.edu, accessed December 22, 2016 (English).
- ^ Kadua acuminata at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed December 22, 2016.
