Impatienshambaeksanensis (Balsaminaceae), a new species from South Korea

Abstract

A new species Impatienshambaeksanensis from Gangwon-do, South Korea, is described and illustrated, based on its morphology and distribution. I.hambaeksanensis is different from I.furcillata, another similar Impatiens species in South Korea, in some ways: I.hambaeksanensis possesses a serrate leaf margin with flat tooth tip, while I.furcillata possesses a crenate leaf margin with erect tooth tip; it has an erect inflorescence, while I.furcillata has a pendulous inflorescence; it has a smaller flower which is 2-2.6 cm long, while I.furcillata has a flower of 2.3-3.2 cm; the flower is white or pinkish-white with yellowish and purplish spots, while I.furcillata has a white lower sepal and pinkish-white lateral united petals with yellowish spots; the distal part of the lower sepal is mostly not coiled or rarely 1-coiled, while that of I.furcillata is never coiled; the spur tip is expanded, round and slightly biparted, while that of I.furcillata is expanded, ellipsoidal and clearly biparted. A taxonomic description, a holotype and photos of morphological characteristics of the new species are provided. A table which includes the morphological comparison and a geographical distribution map are presented as well.

Keywords: Gangwon-do; Korean endemic; morphology; new species; taxonomy.

Figure 1.

Holotype of Impatienshambaeksanensis B.U.Oh, B.U.Oh & J.O.Kim 210905-001 (KB).

Figure 2.

Morphological characteristics of ImpatienshambaeksanensisA habit B stem C leaf D inflorescence E frontal view of flower F lateral view of flower G fruit H seed. All photos by Byoung-Un Oh.

Figure 3.

Flower variation ranges of ImpatienshambaeksanensisA–H lower sepals I–P distal part of lower sepals and spur tips. Scale bars: 5 mm (A–H); 1 mm (I–P).

Figure 4.

Reproductive organs and their vasculatures of Impatienshambaeksanensis (White spots between veins are raphides) A frontal view of flower B lateral view of flower C lateral sepals D lower sepal E dorsal petal F lateral united petals G stamen H pistil. Scale bars: 5 mm (D); 2 mm (C, E, F, G, H).

Figure 5.

Major morphological differences between Impatienshambaeksanensis (A–D) and I.furcillata (E–H) A, E inflorescences B, F lateral view of flowers and spur tip directions C, G leaves (C1, G1 bird’s-eye view C2, G2 lateral view) D, H shape of spur tips. Scale bar: 0.3 mm (D, H). All photos by Byoung-Un Oh.

Figure 6.

Geographical distribution of Impatienshambaeksanensis (●) and I.furcillata (○).