Nuphar microphylla
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Nuphar microphylla , illustration |
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| ( Pers. ) Fernald |
Nuphar microphylla is a species ofthe water lily family (Nymphaeaceae).
features
Nuphar microphylla is a floating leaf plant . Their slender rhizome is 0.5 to 2.0 centimeters in diameter. There are leaves that are submerged and floating on the water . The leaf stalks are thinly pressed and have a diameter of 1 to 2.5 millimeters. The floating leaf blades are green to purple, broadly elliptical to ovate and measure 4.2 to 13 × 3.2 to 8 centimeters. They are 1.1 to 1.6 times as long as they are wide. There are 5 to 15 side veins on each side. The leaf blade is glabrous to densely downy on the underside.
The flowers are 1.2 to 2.1 centimeters in diameter. The inflorescence axis has a diameter of 1.5 to 4 millimeters and is bald or occasionally hairy. The mostly 5 (rarely up to 10) sepals are yellow, greenish towards the base and rarely red in color. They are obovate, their tips are rounded. The petals are thin, spatulate and yellow-orange. The anthers are yellow, 1 to 3 millimeters long and about five times shorter than the stamens. The fruits are spherical-egg-shaped to urn-shaped, green, brown or purple in color and measure 1 to 2.5 × 0.9 to 2.1 centimeters. They are 0.9 to 2.1 times as long as they are wide. The walls of the ovary are smooth. The slender and elongated base of the fruit is narrow, its diameter is only 1 to 3 millimeters. It is contracted, furrowed, and usually 0.15 times as wide as the ovary. The scar disc has a diameter of 2 to 6 millimeters and is 0.26 times as wide as the ovary. It is dark red and deeply lobed to notched. The 5 to 11 scar rays are straight and end at or up to 0.2 millimeters from the edge. The seeds are yellowish brown to brown, egg-shaped and measure 3 to 3.5 × 1.5 to 2.5 millimeters.
The flowering period extends from June to September.
The number of chromosomes is 2n = 34.
Occurrence
Nuphar microphylla grows in calm lakes, ponds and sometimes in slow flowing rivers. The area covers northeast North America from Nova Scotia west to southern Manitoba in Canada and south to northern Minnesota and northern Michigan to New Jersey in the USA. The species occurs from sea level to an altitude of 400 meters.
Systematics
Nuphar microphylla is the only American representative of the otherwise only ancient widespread section Nuphar from the genus of pond roses. Cladistic analyzes of morphological and molecular data showed a very close relationship with the lesser pond rose ( Nuphar pumila ). In areas where bull's head pond rose ( Nuphar variegata ) occurs sympatric with Nuphar microphylla , the two species form the partially fertile hybrid Nuphar × rubrodisca .
use
The species seems to have been cultivated in Europe at the beginning of the 19th century, where it was used as an ornamental plant for water tubs and aquariums due to its small size.
literature
- Donald J. Padgett: A Monograph of Nuphar (Nymphaeaceae) . Rhodora, Vol. 109, No. 937, pp. 1-95, 2007.
Individual evidence
- ↑ Nuphar microphylla at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis