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A Revision of Genus Yinshania (Cruciferae)

Zhang Yu-Hua   

  1. (lnstitute of Materia Medica, Zhejiang Academy of Medicine, Hangzhou)
  • Received:1900-01-01 Revised:1900-01-01 Online:1987-06-18 Published:1987-06-18
  • Contact: Zhang Yu-Hua

Abstract:

The genus Yinshania was established by Ma Yu-chuan and Zhao Yi-zhi in 1979,
when only one species, Y. albiflora Ma et Y. Z. Zhao, was discribed from Nei Monggol.  In
the present paper the genus Yinshania is revised and four new species, two new varieties and
four new combinetions are reported.  There are so far eight species and two varieties in total
in this genus.
     Important morphological characters of the genus are analysed, which shows that the lateral
nectariferous glands positioned at lateral base of the brevistamens are triangularovoid; there are
dense minute pustules on the surface of valves, which is easily neglected because the pustules disap-
pear or shrinked when dry; simple or furcate hairs are present in the most species, seldom absent;
the shape of pollen grains is relatively steady, elliptic or long-elliptic, with the polar view trifid-
circular, the equatorial view elliptic or long elliptic, the aperture 3-colpate, exine reticular.
     The type of genus Yinshania is changed.  Cochlearia acutangula O. E. Schulz was published
in 1929, but Y. albiflora Ma et Y. Z. Zhao in 1979.  They are the same species and a new com-
binetion, Y. acutangula (O. E. Schulz) Y. H. Zhang, is made. Thus, the type of genus Yin-
shania should be changed to Y. acutangula (O. E. Schulz) Y. H. Zhang.
     Besides, He Ye-qi 6121 (paratype, PE), which is different from Y. acutangula var. albif-
lora, is separated from it and transferred the typical variety, Y. acutangula.
     According to the characters of fruit shape the genus Yinshania is divided into two sections,
namely, Sect.  Microcarpa and Sect. Yinshania, and then Sect. Yinshania is subdivided into two
series.
     Sect. 1. Microcarpa. Silicles widely ovoid or subglobose, 1-2.2 mm long, 0.8-2.2 mm wide,
the ratio of length and width about 1.1.
     Sect. 2. Yinshania. Silicles oblong, oblong-ovoid or long-lanceolate, ellipsoidal, 1.5-4.5 mm
long, 0.3-1.5 mm wide, the ratio of length and width about 2.5-3.3.
     Ser. 1. Henryanae. Raches flexuose; plants densely  hairy; leaves  3-5-foliolate,  seldom
pinnatipartite or pinnatisect.
     Ser. 2. Yinshania. Raches non flexuose; plants sparsely hairy; leaves pinnatisect or pinna-
tipartite.
     The genus Yinshania is a genus endemic to China, with their range from eastern Xizang to
western Hubei from northern Guizhou to central Nei Monggol.  The taxa are mostly of a small
area.  Sect. Microcarpa is concentrated in Sichuan and southern Gansu;  Sect.  Yinshania is
spread from Xizang and Sichuan, nouthwards to Gansu, Ningxia, Shanxi, Hebei and Nei Mong-
gol (Ser. Yinshania); and from Sichuan south-eastwards to Guizhou and Hebei (Ser. Henrya-
nae).  There are five species in Sichuan.  The present paper conjectures that the distribution
centre of the genus is in the Hengduan Mountains and its adjacent areas.

Key words: Yinshania, Sect.Microcarpa, Sect.Yinshania, revision

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