Abstract
Iris dabashanensis C.A.Wilson, sp. nov. and I. probstii C.A.Wilson, sp. nov. from China are described and illustrated. Both species occur on grassy slopes in mountainous regions of south-central China. The former is known from the Daba Mountains in rocky, calcareous soils associated with shrubs or mixed conifer and hardwood forests, while the latter is known from a region of karst terrain beside rice fields or under pine woods in Guizhou Province. Molecular data resolves both species in series Chinenses in a subclade that also includes I. odaesanensis, while morphologically they are similar to I. henryi. These newly described species are two of four members of series Chinenses that occur in south-central China.
Highlights
The two new species and I. henryi share several characteristics that distinguish them from I. cavaleriei, I. grijsi, and I. speculatrix, including smaller flowers, slender rhizomes that are short, and long slender pedicels that result in exerted flowers and ovaries
Iris odaesanensis shares the characters of short floral tubes and long pedicels with the two new species and I. henryi but it has leaves that are about 1 cm in width
Because materials of I. henryi were not available for molecular studies it is unknown if all series Chinenses species with short floral tubes and long pedicels are resolved in a clade
Summary
Comprises several Asian species that have short rhizomes, stolons, and small, open flowers where petals and sepals are horizontal. Dykes (1913) included four species in his informal group (the Chinese group), Lawrence (1953) circumscribed the series to include five species, Mathew (1989) recognized six species, and BIS (1997) recognized seven species in the series (Table 1).
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