Key to Chinese species of Scoparia based on known male genitalia

1. Phallus without cornutus ............................................................................................................ S. afghanorum Leraut

- Phallus with cornutus .................................................................................................................................................. 2

2. Phallus with one cornutus ........................................................................................................................................... 3

- Phallus with several cornuti ........................................................................................................................................ 6

3. Cornutus straight ......................................................................................................................................................... 4

- Cornutus curved .......................................................................................................................................................... 5

4. Uncus narrow basally, broadening towards apex; gnathos narrow triangular; free distal process at two thirds of valva ....................................................................................................................................................... S. subgracilis Sasaki

- Uncus broad basally, tapering to apex; gnathos slender; free distal process at apex of valva ..... S. tohokuensis Inoue

5. Cornutus S-shaped distally .................................................................................................................. S. utsugii Inoue

- Cornutus annular distally .................................................................................................................. S. uncinata sp. n.

6. Phallus with one group of cornuti ............................................................................................................................... 7

- Phallus with two groups of cornuti ........................................................................................................................... 16

7. Cornuti tiny spinelike, attached to a scobinate ovate plate ......................................................... S. congestalis Walker

- Cornuti small or large spinelike, without plate ........................................................................................................... 8

8. Uncus bluntly rounded apically .................................................................................................................................. 9

- Uncus pointed apically .............................................................................................................................................. 13

9. Juxta V-shaped .......................................................................................................................................................... 10

- Juxta ovate ................................................................................................................................................................ 11

10. Ventral fold of sacculus developed; apical spine of phallus long and thin, opening of ductus ejaculatorius at one fifth of phallus ....................................................................................................................................... S. largispinea sp. n.

- Ventral fold of sacculus inconspicuous; apical spine of phallus absent, opening of ductus ejaculatorius at one third of phallus ................................................................................................................................................. S. spinosa sp. n.

11. Cornuti tightly compacted into a fishhook-shaped bundle, basal and medial parts attached with six and tip with two tiny spines ........................................................................................................................................ S. caradjai Leraut

- Cornuti consisting of spines of various size, arranged in a row ............................................................................... 12

12. Cornuti consisting of four long spines, much longer than one fourth length of phallus ............. S. jiuzhaiensis sp. n.

- Cornuti consisting of more than six short spines, much shorter than one fourth length of phallus ............................... ........................................................................................................................................................ S. nipponalis Inoue

13. Cornuti thornlike or thick spinelike .......................................................................................................................... 14

- Cornuti long and thin spinelike ................................................................................................................................. 15

14. Cornuti consisting of six to seven thorns arranged in a row, about half length of phallus .............. S. brevituba sp. n.

- Cornuti consisting of some spines of various size tightly compacted into a bundle, about third as long as phallus .... ................................................................................................................................................ S. ancipitella (La Harpe)

15. Valva about two thirds length of phallus ...................................................................................... S. yamanakai Inoue

- Valva nearly as long as phallus ................................................................................................... S. taiwanensis Sasaki

16. Uncus ovate ............................................................................................................................................................... 17

- Uncus triangular ........................................................................................................................................................ 18

17. Juxta covered with granules and small spines posteriorly; one group of cornuti arranged in a row, another group of cornuti arranged in a cluster and surrounded with tiny spines .................................................... S. taiwanensis Sasaki

- Juxta without granules and spines; each group of cornuti arranged in a row, not surrounded with tiny spines ............ .............................................................................................................................................................. S. bifaria sp. n.

18. Costa convex at middle ..................................................................................................................... S. sinensis Leraut

- Costa straight ...................................................................................................................................... S. spinata Inoue