Siliquamomum phamhoangii
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| Luu & H.Đ. Tears |
Siliquamomum phamhoangii is a species of the genus Siliquamomum withinthe ginger family (Zingiberaceae). It occurs in southern Vietnam .
description
Vegetative characteristics
Siliquamomum phamhoangii grows as a perennial , herbaceous plant that can reach heights of 0.8 to 1 meter. The inside cream-yellow and outside greenish cream-colored rhizomes are covered with scales on the outside. The rhizome is 2 to 3 centimeters long between the individual stems or "pseudo-trunks". From each rhizome go more, a loose Horst forming stems having from which up to a height of 35 to 40 centimeters above the floor no leaves. At the base, the stems have green and wine-red dotted leaf sheaths with paper-like, black edges. The dark wine-red to black, paper-like ligules are 0.3 to 0.4 centimeters long; their upper end is lobed twice.
Each stem has five to seven leaves . These are divided into petiole and leaf blade. The green runny petiole is bare and 2 to 4 inches long and 0.3 to 0.35 inches thick. The simple leaf blade is egg-shaped to approximately elliptical with a length of 16 to 34 centimeters and a width of 6 to 8 centimeters. The hairless top of the leaf is green while the also bald underside of the leaf is pale green. The leaf margins are entire.
Generative characteristics
As far as is known, the flowering time of Siliquamomum phamhoangii covers the month of March while the fruits ripen in April. At the end, on an inflorescence stem enclosed by the leaf sheaths, there is a thyrsus-like inflorescence in which the eight to ten flowers are close together. The light green bracts at the base of the inflorescence are boat-shaped with a length of around 5 centimeters and a width of around 0.8 centimeters. They fall off after a short time. The strongly receded or completely missing bracts of the fertile flowers are hairless and can be up to 2.7 millimeters long. Cover sheets are missing.
The hermaphroditic, about 5.5 to 6.5 centimeters long flowers are zygomorphic and threefold with double, yellowish white perianths and are on a 0.45 to 0.7 centimeter long and 0.12 to 0.15 centimeter thick, green one and bare flower stalk. The three translucent, white and externally hairless sepals are fused together in a tubular shape and are 2 to 2.5 centimeters long and 0.7 to 0.8 centimeters wide longer than the corolla tube. On one side the calyx tube is split about 1.2 centimeters deep. They are triple-toothed, with the calyx teeth 0.7 to 0.9 inches long. The three petals are fused to 1.3 to 1.4 centimeters long, pale greenish to creamy white and bare corolla tubes. There are three transparent, yellowish white and hairless corolla lobes. The middle crown lobe is egg-shaped with a length of about 2 centimeters and a width of about 1 centimeter and has a rounded upper end. The two lateral corolla lobes are a bit narrower with a length of about 2 centimeters and a width of about 0.8 centimeters and are also egg-shaped with a rounded tip. Only the middle of the 1.6 to 1.7 cm long stamens of the inner circle is fertile . The fertile stamen has an approximately 0.45 centimeter long and 0.26 centimeter wide, hairless, creamy white stamen . The pale yellow to green anthers with glandular hairs on the edges are around 1.4 centimeters long and about 0.45 centimeters wide. The staminodes of the inner circle are fused into an egg-shaped and triple lobed labellum with wavy and finely sawn edges. The approximately 2.4 centimeters long and 1.6 centimeters wide labellum is light yellow with a dark green to yellowish green spot at the top and another yellow spot in the middle; it is hairless. With a length of 1.2 to 1.4 centimeters and a width of 0.3 to 0.4 centimeters, the lateral staminodes are oblong-inverted-egg-shaped with a sawn tip and are fused with the labellum in their lower third. Three carpels are fused into a three-chambered, green, hairless and approximately cylindrical ovary with a length of 1.2 to 1.8 centimeters and a diameter of about 0.2 centimeters . The 2.7 to 2.8 centimeters long, cream-colored stylus is hairless and fused with the corolla tube and ends in a club-shaped scar with a ciliate tip about 0.15 centimeters long and 0.18 centimeters wide .
The capsule fruits are 6 to 10 inches long and 0.5 to 0.8 inches thick. They contain seeds that are 0.3 to 0.6 inches long and around 0.2 inches thick.
Occurrence
The natural range of Siliquamomum phamhoangii is in southern Vietnam . It includes previously known as far as a location in the province of Gia Lai nearby National Park Kon Ka Kinh . The species grows there on moist soils in evergreen mountain forests.
Taxonomy
The first description as Siliquamomum phamhoangii was made in 2017 by Lưu Hồng Trường and Trần Hữu Đăng in Phytotaxa , volume 314, number 1, page 135. The specific epithet phamhoangii honors Phạm Hoàng Hộ who between 1965 and 1984 as professor of biology at the University of Ho-Chi -Minh-Stadt and has made a contribution to the study of the flora of Vietnam.
swell
- Lưu Hồng Trường, Trần Hữu Đăng, Trần Ngọc Toàn, Nguyễn Văn Hoan & Phạm Ngọc Bình: Siliquamomum phamhoangii, a new species of Zingiberaceae from the Central Highlands, Vietnam . In: Phytotaxa . tape 314 , no. 1 . Magnolia Press, 2017, ISSN 1179-3163 , pp. 135-139 , doi : 10.11646 / phytotaxa.314.1.14 .
Individual evidence
- ↑ a b c d e f g Lưu Hồng Trường, Trần Hữu Đăng, Trần Ngọc Toàn, Nguyễn Văn Hoan & Phạm Ngọc Bình: Siliquamomum phamhoangii, a new species of Zingiberaceae from the Central Highlands, Vietnam . In: Phytotaxa . tape 314 , no. 1 . Magnolia Press, 2017, ISSN 1179-3163 , pp. 135-139 , doi : 10.11646 / phytotaxa.314.1.14 .