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| Lysimachia sedoides W.B.Xu, C.Y.Zou & B.Pan, in Pan, Zou et Xu, 2022. Lysimachia |
Abstract
Lysimachia sedoides, a rare new species of Primulaceae from a karst cave in northern Guangxi, China, is described and illustrated. It is similar to L. rupestris F.H.Chen & C.M.Hu in having rosette leaves and copiously glandular dots on young parts of shoot apex, but differs markedly in the smaller plant size, fleshy leaf blade, with a size of 10–30 × 3–8 mm, and the length of offsets never exceeding 5 cm.
Keyword: karst cave, limestone flora, Lysimachia rupestris, Lysimachia subgen. Idiophyton, plant taxonomy
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| Lysimachia sedoides. A: Habitat. B: Habit. C: Plant with flowers. D: Plant with young fruits. E: Fruit stalk and young capsule. F: Leaves, adaxial view. G: Leaves, abaxial view. H: Flower, front view. I: Fruiting branch. J: Dissection of a flower: a. Petals, b. Calyx lobes, c. Stamens. K: Flower, back view. |
Lysimachia sedoides W.B.Xu, C.Y.Zou & B.Pan, sp. nov.
Diagnosis: Lysimachia sedoides is similar to L. rupestris F.H.Chen & C.M.Hu (1979: 40) (Figs. 2B & S1) in having rosette leaves, but is distinct in the smaller plants size, leaf blade 10–30 × 3–8 mm (vs. 3–6.5 × 1.2–2.2 cm), offsets shorter than 5 cm (vs. stolons up to 17 cm long), fleshy leaves and slightly fleshy corolla (vs. herbaceous).
Etymology: The species epithet refers to the habit of this new species resembling that species of Sedum Linnaeus (1753: 430).
Distribution and habitat: Lysimachia sedoides was known only from the type locality in Minglun Town, Huanjiang Country, northern Guangxi (Fig. 3). The plants grow on moist limestone rock surfaces at the entrance of a karst cave.
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| Lysimachia rupestris. A: Plants from Ha Long, Vietnam. B: Fruiting branch. C: Plants from Chongzuo City, China. D: Flower, front view. E: Dissection of a fruit. F: Fruit with two calyx lobes removed. |
Bo Pan, Chun-Yu Zou and Wei-Bin Xu. 2022. Lysimachia sedoides (Primulaceae), A rare New Species from Limestone Area in northern Guangxi, China. Taiwania. 67(3); 318-321.
