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SummaryThe North American Prairie plant, Parthenium integrifolium L. (Compositae: Heliantheae: Ambrosiinae) is described and illustrated. Related genera in the subtribe are commented on, as well as the better‐known species, P. argentatum A. Gray, the Guayule Rubber Plant, and infrageneric taxonomy within Parthenium L., in addition to the characteristics of the genus. Aspects of cultivation, propagation, pests and diseases and availability for P. integrifolium are also noted. A full synonymy of this rather variable species is provided, together with type citations, locations of known types, and related commentary. The distribution, habitat and ecology, phenology, common names and conservation status are stated or discussed, together with comments on usage, and the species' roots being used as an adulterant in preparations of Echinacea purpurea (L.) Moench.

SummaryMonarda punctata, the spotted bee‐balm or dotted horsemint, is illustrated from plants growing in the North American Prairie planting at Wakehurst Place; its history, ecology, pollination and cultivation are described.

SummaryCorydalis mucronata Franch., illustrated here, is among several Corydalis collected by Père Armand David in Moupine (now Baoxing) in western Sichuan. It can be a conspicuous plant, forming large populations on shady, wet slopes. Though introduced to England over 20 years ago, it is still rare in gardens. Suggestions for its successful cultivation are given.

SummaryFurcraea macdougallii Matuda, Falso Maguey Grande, is illustrated (Plate 1053). Its history in cultivation and distribution in Mexico are discussed. Its conservation status: probably extinct in the wild.

SummaryThe winter‐flowering Camellia yunnanensis var. camellioides is illustrated. Its origin and cultivation are discussed.

SummaryRosa murielae Rehder & Wilson, is illustrated. Its history, distribution in western China and relationships are discussed.

SummarySalix hookeriana Barratt ex Hook., Hooker's Willow or Yakutat Willow, is illustrated. Its biological characteristics, history in cultivation and distribution are discussed. Infraspecific taxa are compared, and their distinctions noted.

SummaryAsarum sieboldii f. maculatum (Nakai) Yamaji is a low growing, deciduous rhizomatous herb endemic to South Korea. It is illustrated here with a painting, a line drawing and a photograph in the wild; its introduction, horticultural merits and cultivation are discussed. Recent research has shown that the plain‐leaved A. sieboldii Miq. and A. maculatum Nakai are conspecific, and the rank of forma has been chosen here to denote the plant with mottled leaves.

SummaryAsarum satsumense Maekawa is an evergreen herb native to southern Japan and Taiwan, critically endangered in the wild. It is illustrated with a new painting; its introduction, horticultural merits and cultivation are discussed.

SummaryAsarum crassum Maekawa is a rare evergreen perennial, endemic to two small, uninhabited islands off the south coast of Kyūshū island, Japan. It is illustrated here and its introduction, horticultural merits and cultivation are discussed.

SummaryThe widespread Senecio squalidus L. (Compositae: Senecioneae: Senecioninae), a diploid hybrid species with strong self‐incompatibility, that originated in the British Isles within the last 300 years, is described and illustrated. The origins of this species are briefly outlined. The history of the spread of this plant in the British Isles, and the presence of several natural hybrids is commented on. Senecio squalidus can be separated from other species, and hybrids, by allozyme differences. The species synonymy is thus minimal as it originated in the British Isles. Its morphological recognition encompasses a broader concept within Europe, including the hybrid swarm, between S. aethnensis and S. chrysanthemifolia, on Mount Etna, Sicily, where British material was originally derived. Both narrow concept and broad concept synonymy are provided, including full protologue citations and distribution of type material when known.

SummaryVeronica peduncularis M. Bieb. (Plantaginaceae: Veroniceae) is illustrated and described. A short discussion is provided as to the family affiliations of Veronica, with the proposal that, at least in this article, it is considered to belong to the Plantaginaceae. The infrageneric placement of this taxon is also discussed, but with a commentary suggesting dubious results in an earlier molecular study; its placement in Veronica L. subgenus Pentasepalae (Benth.) M.M.Mart. Ort. & Albach & M.A. Fisch. is commented upon. The species belongs in Veronica subsection Petraea Benth. A full synonymy is provided, together with citation of types, and relevant discussion and notes cover the issues with naming this plant and location of type material. Cultivation and propagation guidelines for the species are provided and current availability of cultivars is outlined.

SummaryPassiflora punicea Ruiz & Pavón ex DC., considered by Maxwell T. Masters (1872) and E. P. Killip (1938) to be a synonym of P. vitifolia Kunth is here reinstated at species rank. It is described and illustrated in colour and with black and white line drawings. Its history, distribution, similarities to related species and cultivation are discussed. A key to its closest related species is provided.