Hainanecio (Chinese: 海南菊属)[2] is a genus of flowering perennial herb endemic to Hainan Island, China.[1] A single species, Hainanecio hainanensis, has been described from three populations on Hainan Island. It grows in shade in dense, broadleaved evergreen forests at 900–1200 m above sea level. It flowers from July to August and fruits in September to November.[1]
(C. C. Chang & Y. C. Tseng) Y. Liu & Q. E. Yang[1]
The sole species was first described as Senecio hainanensis by C. C. Chang & Y. C. Tseng (1974) before being transferred to Sinosenecio by C. Jeffrey & Y. L. Chen (1984). It was believed to be the southernmost-occurring species of Sinosenecio before being reclassified in 2011 by Y. Liu & Q. E. Yang as its own genus and species.[1] Molecular phylogenetic analysis places H. hainanensis as an isolated member of the subtribe Senecioninae, being only distantly related to Sinosenecio species with basic chromosome number 30 or Tephroseris species with basic chromosome number 24.[3]Hainanecio chromosomes are significantly smaller (0.8–1.8 μm) than those typical of Sinosenecio (1.2–4.0 μm).[1]
Hainanecio hainanensis may have 1 to several stems, with a stout rhizome up to 10 mm in diameter. The plant has several radical petiolate leaves of ovate to obovate shape with pinnate veining. The single radiate capitulum is white and composed of elliptic-oblong ray florets and many disc florets. The plant has truncate style arms, polarized and radial endothecial cell wall thickenings, and a cylindrical filament collar. It differs notably from Sinosenecio in its anthers that are rounded at the base and have ovoid and bubble-like anther apical appendages with enlarged abaxial cells. The plant lacks a pappus and has an obovoid, glabrous achene. Its pollen grains have a coarse tectum layer and are helianthoid and triporate rather than senecioid and tricolporate as seen in Sinosenecio. Like the subtribe Tussilagininae, it has polar and radial endothecial cell wall thickenings, cylindric antheropodia, and a basic chromosome number of 29.[2]
Referencesedit
^ abcdeLiu, Ying; Yang, Qin-Er (2011). "Hainanecio, a new genus of the Senecioneae, Asteraceae from China" (PDF). Botanical Studies. 52: 115–120. S2CID 49565549.
^ ab"Hainanecio". Flora of China. Retrieved 2021-11-10.
^Liu Y, Yang QE (2011). "Cytology and its systematic implications in Sinosenecio (Senecioneae-Asteraceae) and two closely related genera". Plant Systematics and Evolution. 63 (291): 7–24. doi:10.1007/s00606-010-0365-3.
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hainanecio, chinese, 海南菊属, genus, flowering, perennial, herb, endemic, hainan, island, china, single, species, hainanensis, been, described, from, three, populations, hainan, island, grows, shade, dense, broadleaved, evergreen, forests, 1200, above, level, flo. Hainanecio Chinese 海南菊属 2 is a genus of flowering perennial herb endemic to Hainan Island China 1 A single species Hainanecio hainanensis has been described from three populations on Hainan Island It grows in shade in dense broadleaved evergreen forests at 900 1200 m above sea level It flowers from July to August and fruits in September to November 1 HainanecioScientific classificationKingdom PlantaeClade TracheophytesClade AngiospermsClade EudicotsClade AsteridsOrder AsteralesFamily AsteraceaeSubfamily AsteroideaeTribe SenecioneaeSubtribe SenecioninaeGenus HainanecioY Liu amp Q E YangSpecies H hainanensisBinomial nameHainanecio hainanensis C C Chang amp Y C Tseng Y Liu amp Q E Yang 1 The sole species was first described as Senecio hainanensis by C C Chang amp Y C Tseng 1974 before being transferred to Sinosenecio by C Jeffrey amp Y L Chen 1984 It was believed to be the southernmost occurring species of Sinosenecio before being reclassified in 2011 by Y Liu amp Q E Yang as its own genus and species 1 Molecular phylogenetic analysis places H hainanensis as an isolated member of the subtribe Senecioninae being only distantly related to Sinosenecio species with basic chromosome number 30 or Tephroseris species with basic chromosome number 24 3 Hainanecio chromosomes are significantly smaller 0 8 1 8 mm than those typical of Sinosenecio 1 2 4 0 mm 1 Hainanecio hainanensis may have 1 to several stems with a stout rhizome up to 10 mm in diameter The plant has several radical petiolate leaves of ovate to obovate shape with pinnate veining The single radiate capitulum is white and composed of elliptic oblong ray florets and many disc florets The plant has truncate style arms polarized and radial endothecial cell wall thickenings and a cylindrical filament collar It differs notably from Sinosenecio in its anthers that are rounded at the base and have ovoid and bubble like anther apical appendages with enlarged abaxial cells The plant lacks a pappus and has an obovoid glabrous achene Its pollen grains have a coarse tectum layer and are helianthoid and triporate rather than senecioid and tricolporate as seen in Sinosenecio Like the subtribe Tussilagininae it has polar and radial endothecial cell wall thickenings cylindric antheropodia and a basic chromosome number of 29 2 References edit a b c d e Liu Ying Yang Qin Er 2011 Hainanecio a new genus of the Senecioneae Asteraceae from China PDF Botanical Studies 52 115 120 S2CID 49565549 a b Hainanecio Flora of China Retrieved 2021 11 10 Liu Y Yang QE 2011 Cytology and its systematic implications in Sinosenecio Senecioneae Asteraceae and two closely related genera Plant Systematics and Evolution 63 291 7 24 doi 10 1007 s00606 010 0365 3 nbsp This Senecioneae related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Hainanecio amp oldid 1054750585, wikipedia, wiki, book, books, library,
