Impatiens darachuensis, P. Gyeltshen, W. Adamowski & Phuntsho, 2023

Gyeltshen, Phub, Adamowski, Wojciech, Phuntsho, Tashi & Thinley, Kinga, 2023, IMPATIENS DARACHUENSIS (BALSAMINACEAE), A NEW SPECIES FROM BHUTAN HIMALAYA, Edinburgh Journal of Botany 80 (1939), pp. 1-12 : 8-9

Key to Impatiens darachuensis and closely allied species

1a. Lateral sepals 2 ___________________________________________________________________ 2

1b. Lateral sepals 4 ___________________________________________________________________ 5

2a. Inflorescence raceme _____________________________________________________________ 3

2b. Inflorescence subscorpioid cyme __________________________________________________ 4

3a. Peduncle 25–65(–110) mm long, appendage on dorsal petal 4–16 mm long ___ I. jurpia

3b. Peduncle 4–15 mm long, appendage on dorsal petal 3–6 mm long _________ I. discolor

4a. Leaf margin crenate, capsule cylindrical _________________________________ I. cathcartii

4b. Leaf margin coarsely serrate, capsule subfusiform ________________________ I. duclouxii

5a. Capsule linear _____________________________________________________________________ 6

5b. Capsule fusiform to subfusiform __________________________________________________ 7 6a. Dorsal petal keeled, floral bracts ovate to lanceolate _______________________ I. laevigata

6b. Dorsal petal not keeled, floral bracts orbicular ______________________ I. pseudolaevigata

7a. Leaf base rounded or obtuse; lower sepal bucciniform abruptly constricted into short deep incurved spur, inner lateral sepals oblong _______________________ I. darachuensis

7b. Leaf base cuneate; lower sepal narrowly bucciniform, gradually constricted into long coiled or circinate spur, inner lateral sepals triangular _______________ I. bakthangensis