• Source: Cypripedium macranthos

Cypripedium macranthos, the large-flowered cypripedium, is a species of orchid. It is native to Russia and East Asia.




Distribution and habitat


C. macranthos has a widespread distribution across Russia (European Russia and Siberia), Kazakhstan, Mongolia (Huvsgul, Hentii, Mongol Daguur, and Khyangan), Japan, Korea, China (Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, and Shandong provinces) and Taiwan. It may also be found in Belarus and Ukraine, but this has not been confirmed. It grows in a variety of habitats from sea level to 2,400 m (7,900 ft) above sea level, including meadows, forests, woodland edges, scrub, riparian areas, and grassy slopes. It prefers well-drained, humus-rich soils but tolerates both acidic and alkaline substrates. Though it prefers slightly shaded areas, it will also grow in more open habitat.




Description


C. macranthos is a herbaceous plant growing 25–50 cm (9.8–19.7 in) tall. The upright stem arises from a short, thick rhizome with several sheaths near the base. Each plant has three to four elliptic or elliptic-lanceolate leaves, each measuring 10–15 cm (3.9–5.9 in) by 6–8 cm (2.4–3.1 in). The inflorescence typically bears a single red, pink, or purple flower. Rarely, two flowers may be present, or the flower may be white in colour. The dorsal sepal is ovate-elliptic with a pointed tip, measuring 4–5 cm (1.6–2.0 in) by 2.5–3 cm (0.98–1.18 in). The synsepal is ovate with a slightly two-loved tip, measuring 3–4 cm (1.2–1.6 in) 1.5–2 cm (0.59–0.79 in). The petals are lanceolate and each measure 4.5–6 cm (1.8–2.4 in) by 1.5–2.5 cm (0.59–0.98 in). The labellum measures 4.5–5.5 cm (1.8–2.2 in) and is deeply pouched, with a small opening measuring 1.5 cm (0.59 in) across. The fruit is an ellipsoid capsule measuring approximately 4 cm (1.6 in) long.
C. macranthos is similar in appearance to Cypripedium tibeticum, which has slightly larger, darker flowers.




Ecology


C. macranthos is capable of reproducing both sexually and vegetatively. Flowering occurs from from June to July, with fruits appearing from August to September. Its flowers are self-compatible and primarily pollinated by bumblebee queens.
Cypripedium × ventricosum is a naturally occurring hybrid between C. macranthos and C. calceolus.




References






External links


Media related to Cypripedium macranthos at Wikimedia Commons
Data related to Cypripedium macranthos at Wikispecies

Kata Kunci Pencarian:

• Cypripedium
• Sumita, Iwate
• Cypripedium macranthos
• Cypripedium
• Cypripedium tibeticum
• Cypripedium franchetii
• Berd Rocks
• Tofalariya
• Megachile melanophaea
• List of least concern plants