科研之友
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摘要
The species of Codonopsis subg. Pseudocodonopsis are inodorous herbaceous geophytes with an unbranched tuberous root no more than four times longer than thick; twining stems leafy at least toward base; horizontal to erect usually solitary terminal flowers, in which the corolla is rotate and cleft for more than three-fourths its length; pollen grains with 5-10 colpi covering less than one-fourth the distance from pole to pole and spinules 2-3 mu m long; and a 3-locular ovary that forms an obconic capsule with a relatively short dehiscent apex, containing numerous smooth or finely striate seeds. The most recent synopsis recognized C. convolvulacea (here designated as the type of the subgenus), C. efilamentosa, C. forrestii, C. grey-wilsonii (as C. nepalensis, nom. illeg.), C. limprichtii (as "C. pinifolia", nom. invalid.), and C. vinciflora. Codonopsis rosulata is also a member of C. subg. Pseudocodonopsis despite its scapose non-twining stem and basally rosulate leaves. Codonopsis hirsuta was previously included in C. convolvulacea, but here is judged to be a distinct species allied to C. limprichtii. Codonopsis mairei was previously included in C. forrestii, but is here judged to be a distinct species allied to C. convolvulacea. Plants known only from cultivation, which have been identified as C. forrestii but differ from all known species in several characters, are described here as C. macrophylla, sp. nov. Yunnan is the center of diversity, harboring eight out of ten species; the exceptions are C. grey-wilsonii, endemic to the eastern Himalaya; and C. macrophylla, of uncertain provenance. From Yunnan, the ranges of various species extend into Sichuan, Guizhou, Tibet (Xizang), and/or Burma (Myanmar).
- 出版日期2010-10
