foc
《中国植物志》英文修订版
Flora of China
  FOC Vol.8 (2001)              | Family List  Brassicaceae  PDF Taphrospermum  PDF   |  eFloras.org Link Font:+ Big | - Small
   88. Taphrospermum  C. A. Meyer
沟子荠属   gou zi ji shu
  

Glaribraya H. Hara.

  

Herbs biennial or perennial. Trichomes simple, rarely absent. Roots often fleshy, narrowly fusiform, basally with a whorl of caducous or persistent scalelike leaves. Stems prostrate, ascending, or erect. Basal leaves petiolate, not rosulate, simple, entire. Cauline leaves petiolate, entire, lowermost whorled or alternate. Racemes many flowered, bracteate throughout or rarely only basally. Fruiting pedicels ascending or divaricate, straight or recurved. Sepals oblong, erect, glabrous or subapically pubescent, base of lateral pair not saccate. Petals white, longer than sepals; blade obovate or broadly so, apex rounded or emarginate; claw obscure. Stamens 6, subtetradynamous; filaments of median pairs dilated at base; anthers ovate, apex rounded. Nectar glands confluent, subtending bases of all stamens. Ovules to 12 per ovary. Fruit dehiscent siliques or silicles, cylindric, narrowly conical, or obcordate, ovate, or oblong, angustiseptate, terete, or latiseptate, sessile or subsessile; valves distinctly veined, glabrous or papillate, torulose or smooth; replum widely flattened throughout or only basally; septum complete, rarely absent or perforate and reduced to a rim; style to 3 mm; stigma capitate, entire. Seeds uniseriate or biseriate, wingless, oblong, plump or flattened; seed coat foveolate or papillate, not mucilaginous when wetted; cotyledons incumbent, oblique, or accumbent.

Seven species: Bhutan, China, India, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Russia, Tajikistan; six species (three endemic) in China.

Taphrospermum platypetalum Schrenk, which is endemic to Soongaria in Kazakhstan, might also be present in neighboring Xinjiang. It has racemes bracteate only basally, glabrous sepals, and cylindric fruit.

  
1At least some of the lowermost cauline leaves verticillate, other leaves opposite and/or alternate.(2)
+All leaves alternate.(4)
   
2(1)Plants densely hirsute throughout with trichomes 0.5-1 mm6  T. tibeticum    西藏沟子荠
+Plants glabrous or puberulent with papillae 0.05-0.2 mm.(3)
   
3(2)Petals broadly obovate, (7-)8-9(-10) × (3.5-)4.5-6 mm; seeds foveolate; sepals caducous, margin ciliolate; septum absent4  T. verticillatum    轮叶沟子荠
+Petals narrowly obovate, 3-3.5 × 1.5-2 mm; seeds papillate; sepals persistent, margin not ciliolate; septum complete5  T. lowndesii    郎氏沟子荠
   
4(1)At least some leaves dentate; fruit oblong or ovate, latiseptate2  T. himalaicum    须弥沟子荠
+Leaves entire or rarely repand; fruit narrowly conical or obcordate, angustiseptate at least basally.(5)
   
5(4)Fruit obcordate, not torulose, (4-)5-7 mm wide; septum absent; cotyledons accumbent3  T. fontanum    泉沟子荠
+Fruit narrowly concial, torulose, (1.8-)2-2.5(-3) mm wide; septum complete or rarely reduced to a rim; cotyledons incumbent1  T. altaicum    沟子荠
   
   Lower Taxon
  • Taphrospermum altaicum  C. A. Meyer  沟子荠
  • Taphrospermum himalaicum  (J. D. Hooker & Thomson) Al-Shehbaz et al.  须弥沟子荠
  • Taphrospermum fontanum  (Maximowicz) Al-Shehbaz & G. Yang  泉沟子荠
  • Taphrospermum fontanum subsp. fontanum    泉沟子荠(原亚种)
  • Taphrospermum fontanum subsp. microspermum  Al-Shehbaz & G. Yang  小籽泉沟子荠
  • Taphrospermum verticillatum  (Jeffrey & W. W. Smith) Al-Shehbaz  轮叶沟子荠
  • Taphrospermum lowndesii  (H. Hara) Al-Shehbaz  郎氏沟子荠
  • Taphrospermum tibeticum  (O. E. Schulz) Al-Shehbaz  西藏沟子荠