Kadua tryblium
| Kadua tryblium | ||||||||||||
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| Kadua tryblium | ||||||||||||
| ( DRHerbst & WLWagner ) WLWagner & Lorence |
Kadua tryblium is a plant from the genus Kadua in the family of the Rubiaceae (Rubiaceae). It is endemic to Hawaii .
description
Vegetative characteristics
Kadua tryblium grows as a climbing, little branched shrub whose stems can reach lengths of up to 5 meters. Roots can form where the stems touch the ground. All shoots are hairless.
The constantly against arranged on the branches leaves are divided into a petiole and leaf blade. The furrowed petiole is 1.8 to 5.5 inches long. The simple, leathery leaf blade has a length of 13 to 22 centimeters and a width of 3 to 7.5 centimeters, somewhat unevenly elongated-elliptical through elliptical to almost elliptical. The top of the leaf blade is green while the underside is pale green with purple to brownish purple spots. The base of the blade is wedge-shaped, sometimes tapering to a point, the tip of the blade is long, or sometimes also tapering, the edge of the blade is entire. Several pairs of hairless lateral nerves branch off from each side of the leaf central nerve and the higher-order leaf veins form an indistinct pattern. The membranous stipules resemble the deciduous leaves, are fused with the base of the petiole and thus form a cup-like leaf sheath . The leaf sheath becomes 2.5 to 4 centimeters long and has a 0.7 to 0.9 centimeter long, fleshy spike tip.
Generative characteristics
The dense, axillary zymous inflorescences are on a 0.1 to 1.2 centimeter long inflorescence stem. The inflorescences contain several single stalked flowers. The flower stalks are 0.1 to 0.2 inches long.
The four-fold flowers are radial symmetry and there are two different flower shapes. The flower shape with short stylus is sterile fertile while the long-styled flower shape. The top-shaped flower cup is 0.15 to 0.2 centimeters long. The sepals are fused together to form a calyx tube. The calyx lobes are egg-shaped with a length of 0.2 to 0.3 centimeters and have slightly frayed edges. The fleshy, yellowish green petals are fused together like a funnel. The reddish purple speckled corolla tube reaches a length of 0.65 to 0.9 centimeters and has a square cross-section. The four broad, egg-shaped corolla lobes reach lengths of 0.25 to 0.3 centimeters and have a small appendage at the tip. The bald stylus is lobed twice, with the lobes compressed in short-styled flowers and wide apart in long-styled flowers.
The stone fruit- like capsule fruits are approximately spherical in shape with a thickness of 0.4 to 0.5 centimeters. Each of the fruits contains several dark brown seeds. They are irregularly shaped and the seed coat is covered with small papillae .
Occurrence
The natural range of Kadua tryblium is on the Hawaii island of Kaua'i . It includes Mount Kahili , the area around the Wahiawa River and the outskirts of the Kalalau Valley.
Taxonomy
The first description as Hedyotis tryblium was in 1989 by Derral Raymon Herbst and Warren L. Wagner in Bishop Museum Occasional Papers . In 2005 Warren L. Wagner and David H. Lorence transferred the species as Kadua tryblium in Systematic Botany to the genus Kadua .
Individual evidence
- ↑ a b c d e f Kadua tryblium. In: Flora of the Hawaiian Islands. www.botany.si.edu/pacificislandbiodiversity/hawaiianflora, accessed on February 24, 2017 (English).
- ^ Hedyotis tryblium at Tropicos.org. Missouri Botanical Garden, St. Louis. Retrieved February 24, 2017.
- ↑ Rafaël Govaerts (ed.): Kadua tryblium. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 24, 2017.