Oenothera 待宵草屬
型態特徵
Annual, biennial or perennial herbs, from a taproot or clumped and spreading by rhizomes or lateral roots. Leaves alternate, often in a basal rosette, entire, toothed, or pinnately lobed; stipules absent. Flowers actinomorphic, 4-merous, in axils of upper reduced leaves, usually opening near sunset; sepals 4, reflexed in flower; petals 4, yellow, white or rose-purple, tip often notched; stamens 8; pollen shed singly; ovary 4-locular; stigma deeply 4-lobed. Fruit a many-seeded capsule, usually dehiscent, straight or curved, terete to 4-ribbed or winged, +/- sessile. Seeds in 2 (1 or 3, not in Taiwan) rows per locule or clustered.
A genus of about 120 species native to temperate or subtropical N and S America but some species widely naturalized; five species occur in Taiwan. Several species in Taiwan have the feature of permanent translocation heterozygosity, characterized by self-pollination, about 50% pollen fertility (note: sterile pollen is smaller than fertile and thus can be assessed with a hand lens), and the formation of a ring of 14 chromosomes at meiotic metaphase I.
參考文獻
- RAVEN, PETER H. and PENG, CHING-I, Flora of Taiwan, second edition 3: 937. 1993. (Fl. Taiwan 2nd edit.)
- Dietrich, W. & W.L. Wagner., Systematic Botany Monographs 24: 1-91. 1988. (Syst. Bot. Monogr.)
- Munz, P.A, . N. Amer. Fl. II, 5: 1-278. 1965.
- Peng, C. I & S. Huang., Botanical bulletin of Academia Sinica 27: 45-51. 1986. (Bot. Bull. Acad. Sin.)
種列表
- Oenothera albicaulis
- Oenothera biennis 月見草
- Oenothera bistorta
- Oenothera brevipes
- Oenothera californica var. tyrica
- Oenothera cardiophylla
- Oenothera claviformis var. peirsonii
- Oenothera dentata var. johnstonii
- Oenothera drumnondii 待宵花
- Oenothera fruticosa
- Oenothera glazioviana 黃花月見草
- Oenothera hirta var. typica
- Oenothera laciniata 裂葉月見草
- Oenothera lamarckiana
- Oenothera odorata
- Oenothera rosea 夕化妝
- Oenothera scapoidea
- Oenothera sp.
- Oenothera speciosa 美麗月見草
- Oenothera stricta 待宵草
- Oenothera tetraptera 四翅月見草
- Oenothera trichocalyx
