Lysimachia rupestris F. H. Chen &amp; C. M. Hu 1979
Creators: name: Tong, Yi-Hua
name: Xia, Nian-He
name: Lam, Le Viet
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ericales
Primulaceae
Lysimachia
Lysimachia rupestris

description: <i>Lysimachia rupestris</i> F. H. Chen &amp; C. M. Hu (Fig. 1) <i>In Acta Phytotaxonomica Sinica</i> 17 (4): 40 (1979). SPECIMEN DATA. — <b>Vietnam</b>. Ha Long Bay, Quang Ninh, 20°48’6.56”N, 106°59’40.51”E, alt. 163 m, on rocks at the top of limestone hills, 29.IV.2015, <i>Nian He Xia, Viet Lam Le &amp; Duy Hung Vuong, s.n</i> <i>.</i> (IBSC, two duplicates). DESCRIPTION Herbs perennial, 2-5 cm tall, glabrous throughout. Stems copiously minutely glandular; stolons 2- many, 6-17 cm long, arising from leaf rosette, leafy at apex. Leaves spirally arranged, ± forming a rosette; petiole 1-2 cm long, narrowly winged; leaf blade elliptic-oblanceolate, 3-6.5 × 1.2-2.2 cm, minutely glandular on both sides, base long attenuate, margin narrowly revolute, apex acute to obtuse; veins 3 or 4 pairs, prominent abaxially; veinlets invisible. Flowers solitary, axillary. Pedicel 2.5-4 cm long, densely minutely glandular. Calyx <i>c.</i> 1 cm long, divided to base, lobes lanceolate, <i>c.</i> 1 cm × 1.5-2 mm, densely minutely glandular, especially so at the base, with 1 midvein, reticulate veins inconspicuous. Corolla yellow, divided near to base, lobes oblong-lanceolate, 7-8 mm × <i>c.</i> 2 mm, apex acute to obtuse, glabrous. Stamens 5, filaments <i>c.</i> 1 mm long, connate basally into a ring, free parts <i>c.</i> 0.7 mm long; anthers 4-5 mm, basifixed, opening by apical pores. Style <i>c.</i> 6 mm long, glabrous; stigma punctate, ovary subglobose, glabrous. Capsule subglobose, <i>c.</i> 4 mm in diam. Flowering April-May, fruiting May-August. REMARKS Because of the similar vegetative appearance, Chen &amp; Hu (1979) assigned <i>Lysimachia rupestris</i> together with <i>L. alpestris</i> Champ. ex Benth. to subgenus <i>Lysimachia</i> section <i>Rosulatae</i> R. Knuth only according to the flower characters of <i>L. alpestris</i>, i.e. the dorsifixed anthers opening by lateral slits, which is an important feature of subgenus <i>Lysimachia</i>, although it also has short filaments connate basally into a very short ring and does not bear colored glands, which are the features of subgenus <i>Idiophyton</i> Hand.-Mazz. Bennell &amp; Hu (1983) suggested that subgenus <i>Lysimachia</i> section <i>Rosulatae</i> could be derived directly from subgenus <i>Idiophyton</i> section <i>Apodanthera</i> based on pollen morphology. Recent phylogenetic research confirmed that section <i>Rosulatae</i> is more close to subgenus <i>Idiophyton</i>, rather than subgenus <i>Lysimachia</i> (Hao <i>et al.</i> 2004; Anderberg <i>et al.</i> 2007). Our supplement of the floral characters, especially the basifixed anthers opening by apical pores (Fig. 1F) of <i>L. rupestris</i> is another strong evidence to support that section <i>Rosulatae</i> should be transferred to subgenus <i>Idiophyton</i>. The third species with the spirally aggregated leaves forming nearly rosettes is the recently described <i>L. verbascifolia</i> (Phan &amp; Hu 2011). This species also has basifixed anthers opening by apical pores, which shows its affinity of <i>L. rupestis</i>. However, the lack of stolons in <i>L. verbascifolia</i> adds confusion to the relationship between these species. Thus, there is still much work to do to figure out their systematic position.
description: Published as part of <i>Tong, Yi-Hua, Xia, Nian-He &amp; Lam, Le Viet, 2017, Lysimachia rupestris F. H. Chen &amp; C. M. Hu (Primulaceae): a new record for the flora of Vietnam and reconsideration of its taxonomical position, pp. 125-128 in Adansonia 39 (2)</i> on page 126, DOI: 10.5252/a2017n2a3, http://zenodo.org/record/4599112
description: {"references": ["CHEN F. H. &amp; HU C. M. 1979. - Taxonomic and phytogeographic studies on Chinese species of Lysimachia. Acta Phytotaxonomica Sinica 17 (4): 21 - 53.", "BENNELL A. P. &amp; HU C. M. 1983. - The pollen morphology and taxonomy of Lysimachia. Notes from the Royal Botanic Garden, Edinburgh 40: 425 - 458.", "HAO G., YUAN Y. M., HU C. M., GE X. J. &amp; ZHAO N. X. 2004. - Molecular phylogeny of Lysimachia (Myrsinaceae) based on chloroplast trn L-F and nuclear ribosomal ITS sequences. Molecular Phylogenetics and Evolution 31: 323 - 339. https: // doi. org / 10.1016 / S 1055 - 7903 (03) 00286 - 0", "PHAN K. L. &amp; HU C. M. 2011. - Lysimachia vietnamensis and L. verbascifolia spp. nov. (Primulaceae) from Vietnam. Nordic Journal of Botany 29: 601 - 604. https: // doi. org / 10.1111 / j. 1756 - 1051.2011.01174. x"]}