Impatiens menghuochengensis sp nov (Balsaminaceae) from Sichuan, China

Impatiens menghuochengensis Q Luo. (Balsaminaceae), a new species from Shimian county in southwestern Sichuan province, China, is described and illustrated. It is similar to I. tortisepala J. D. Hooker, but differs in having stem unbranched in lower portion; lateral sepals transparent, obliquely ovate; dorsal petal with central columnar cristate swelling; lateral united petals with distal lobes oblong-dolabriform, apically retuse; lower sepal saccate with purple-red veins, abruptly narrowed at belly into an incurved spur 20-25 mm. The morphological characteristics and surface patterning of the seeds and pollen of the new species are examined under SEM and compared with those of I. tortisepala.