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Isoloma (equal border). Includes Tydaea, Giesleria, Sciadocalyx, Brachyloma. Gesneriaceae. Greenhouse plants, very closely allied to Gesneria and Achimenes.
From Gesneria it is distinguished by absence of well-formed tubers and characters of caps, and anthers, and the 5 lobes of the disk equal; from Achimenes in the more tubular fls. and lobed disk. From Vanhouttea and Diastema the genus is separated technically by the open aestivation. Herbs, with creeping rhizome or base or roots: lvs. opposite, usually villose as in Gesneria: fls. scarlet, orange or vari-colored, usually peduncled in the axils; corolla cylindrical, enlarged above, erect or declined, the limb sub- equally 5-parted.— Species perhaps 50 in. Trop. Amer.
The culture is the same as for achimenes and gesneria. Seeds of the newer hybrids come quickly, and plants bloom the same year. It is probable that the pure species are not in the trade. Like achimenes, gesneria and gloxinia, they have been much hybridized and varied. It is probable that they are hybridized with achimenes and gesneria. It is not known how the current forms have originated. Some of the recent ones have fringed flowers (Gn. 55:348). Because of the variation and hybridization in cultivation, the names in this group are much confused, although few of them appear to be in the trade. The confusion is increased, also, by change in the generic name, from Isoloma to Kohleria. The genus Kohleria was founded by Regel in Flora, April, 1848. Later in the same year, Decaisne founded Isoloma in Revue Horticole, taking up, however, the name from Bentham who had used it for a section of Gesneria in his "Plantae Hartwegianae" in April, 1846. In 1848, also, Decaisne founded the genus Tydaea on Achimenes picta of Bentham (1844); but this genus is now by common consent included in Isoloma (or Kohleria). When this plant, which is apparently the best known garden form, is taken over into Isoloma, it would naturally become I. pictum; but the plant first regularly given the name pictum under Isoloma is I. pictum of Planchon, 1850-51 (and Regel, 1854), which is founded on the Gesneria picta of Hooker (1849), and this is a very different plant from the cultivated Achimenes (or Tydaea) picta, and the latter must take a new name; and it assumes the name given it by Nicholson in 1888, I. bogotense.
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