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FOC | Family List | FOC Vol. 15 | Loganiaceae

1. Mitreola Linnaeus, Opera Varia. 214. 1758.

度量草属 du liang cao shu

Cynoctonum J. F. Gmelin.

Herbs, annual or perennial, erect to creeping, branched or not. Branches terete to 4-angled. Leaves opposite, sessile or petiolate; interpetiolar stipules well developed to reduced to a transverse ridge. Inflorescences terminal and/or axillary, usually long pedunculate, 2 or 3 or more branched, branches scorpioid; bracts small, sepal-like. Flowers sessile or shortly pedicellate, 5-merous. Calyx usually parted almost to base, lobes with membranous margin. Corolla urceolate to campanulate, tube as long as to longer than lobes, lobes imbricate in bud. Stamens inserted at base to middle of corolla tube, included; filaments ± as long as anthers to shorter; anthers usually ovate, introrse, 2-locular. Ovary semi-inferior, 2-locular, with many ovules per locule. Styles cleft at base; stigma capitate or 2-cleft. Capsules 2-horned or 2-lobed, with both carpels dehiscing along ventral suture; horns or lobes erect, divergent, or curved inwards, terminating by style halves; many-seeded. Seeds small, ± subglobose to ellipsoid; seed coat smooth, reticulate, or verrucose; endosperm fleshy; embryo linear.

Seven species: Africa, America, Asia, Pacific Islands; four species in China.

1 Stems terete; internodes villous; interpetiolar stipules reduced to a transverse ridge   1 Mitreola petiolatoides
+ Stems 4-angled or nearly 4-angled when young; internodes glabrous; interpetiolar stipules triangular, ligulate or ocreate.   (2)
2 (1) Annuals; stem erect; corolla tube ± as long as lobes; stamens inserted at base or nearly at base of corolla tube; capsule horns usually curved inwards   2 Mitreola petiolata
+ Perennials; stem creeping; corolla tube longer than lobes; stamens inserted at middle to nearly at corolla mouth; capsule horns or lobes erect.   (3)
3 (2) Leaf blade and petiole glabrous; stipules with glandular hairs at margin; peduncles 1--2.5 cm   3 Mitreola reticulata
+ Leaf blade and petiole abaxially pubescent when young; stipules glabrous at margin; peduncles 3--7 cm   4 Mitreola pedicellata

Lower Taxa


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