XIAMAN LEGUMES KEY BASED ON VEGETATIVE CHARACTERISTICS
所有的种的详细描述见#傅1993,中国植物志第42:1卷. 如国沿样采样,不得不记录在所有生长时期中的植物, 应该"从一张叶认出种". 为了今后工作者的方便提出野外观察及三到到四标本的描述为基础的检索表. 虽然如果观察很细小的植物小叶数量及长度可能偶然有例外,但对于一般的鉴 定应该是比较有用处的.All species given below were described by #Fu (1993)Flora Sinica (vol. 42:1) and the Iconographia Cormophytorum Sinicorum in much more detail. However, their descriptions center on flower and fruit characteristics. If sampling along a transect,every legume (regardless how tiny it is) has to be scored, and so it is necessary to familiarize oneself with their vegetative habitus, in order to identify the plant from one leaf. For the ease of further workers, for the species found at Xiaman, we propose the following key which is based on field experience and the closer observations of ca 3-4 herbarium specimen we took to the Sichuan university. Though for variable traits such as lf number, and len certainly exceptions are found (especially for very very tiny plants) it should be quite helpful for identifying most legumes correctly.
NOTE:
"lf" means leaflets (=folioli, of the pinnate leafs)
"len" means length of foliolum (all numbers in millimeters)
备注: 所有长度为毫米. 光写"长"表示"小叶长度".
leaf has tendrils and even number of lf
羽状叶顶端有须,小叶偶数
lf 2 (len<28) Lathyrus pratensis northern slope
2个小叶(长<28) 阴坡
lf 12-14 (len<11) Vicia amoena southern slope,disturbed sites
12-14个小叶(长<11) 阳坡
leaf has no tendrils and odd number of lf
羽状叶无须,小叶寄数
lf 3
3个小叶
lf round (len<8, clover-like) Trigonella archiducis-..dry,disturbed & sandy soils
小叶圆形(长<8,象三叶草) 干燥及干扰环境
lf lanceolate (len<40) Thermopsis lanceolata dry,disturbed & sandy soils
小叶披针形(长<40) 干燥及干扰环境
lf >3
小叶>3
upper side of lf nude,lower side hairy (lf 9-17,len<7)
小叶上面无毛,下面有毛(差距明显) (小叶9-17,长<7)
Astragalus prattii dry&fertile soils
干燥及肥沃土壤
hair cover of both lf sides similar
小叶上下面毛相似
both sides nude or very poorly haired (naked eye)
双面无毛或毛被很少(肉眼)
len < 7 (lf 17-35) Astragalus polycladus ubiquitous,not very wet habitats
长 < 7 (小叶17-35) 除非润湿地带外到处都有
len > 10
长 > 10
len > 20 (lf 5-13) Astragalus tongolensis rare,twice found one northern slope
长 > 20 (小叶5-13) 罕见,只有两此在阴坡上见到了
len < 20
长 < 20
lf lanceolate(lf 13-15,len<16)Astragal.mahoshanicus fertile plains;tap-root not very developed
小叶披针形(13-15个小叶,长<16) 肥沃的平地,主根不很发达
lf ovate (lf 17-21,len<16) Hedysarum tanguticum northern slopes and hill ridges; note big tap-root;characteristic fruit
小叶椭圆性(17-21个小叶,长<16) 阴坡及毗邻地,主根很发达
both sides hairy
双面有毛
lf round (len<10,lf [7-]9-11) Thibetia himalaica ubiquitous;characteristic fruit
小叶近圆形(长<10,[7-]9-11个小叶) 到处都有(除湿外);其果好认
lf ovate or lanceolate, but not round
小叶椭圆形或披针形,但不是圆形
lf green-yellowish, spade-shaped lf base broader than tip
小叶绿黄色, 铲状其基部比顶端微宽
lf [7-]17-29 (len<15[<6]) Oxytropis kansuensis ubiquitous,but not steep southern slopes
[7-]17-29个小叶(长<15[<6]) 几乎到处都有,但在陡的阳坡没有
lf 13 (len<10) Oxytropis hirta steep southern slopes
13个小叶(长<10) 陡的阳坡
lf dark-green (or brownish/grey after pressing), ovate or lanceolate, len<6
小叶暗绿色(压成表本后程棕灰色),椭圆形或披针形,长<6
stalk very hairy,lf 11-19 Astragalus tanguticus steep southern slopes
茎白毛很多,11-19个小叶 陡的阳坡
stalk nude,lf [9-]17-31 Astragalus sungpanensis ubiquitous,xerophile,dunes
茎几乎无毛,[9-]17-31个小叶 到处都有,喜干,沙丘
Note: Although Astragalus sungpanensis flowers purple and Oxytropis kansuensis flowers yellow-white, both species are similar vegetatively and lf no as well as len vary greatly with the development stage of the plant. For distinguishing them (though Oxytropis leaves are a bit more spade-shaped than Astragalus leaves), we found lf color to be most easy, but one should familiarize oneself in a herbarium (we deposited a set in the SUU herbarium), before going into the field. For beginners it is also recommended to take a close look at Thermopsis lanceolata, because it's habitus is not very legume-like.
备注: 松潘黄芪开花瓣紫色, 甘肃棘豆花瓣黄白, 在营养阶段双者习性（“形态”）接近,小叶数量与长度与植物生长阶段很有关. 虽然棘豆的小叶有时比黄芪的稍为尖锐,为分开这两种我们认为叶的颜色最有用. 去野外之前建议先在标本室熟习. 对于豆科的初学者并且建议详细地看黄桦的表本,其习性不象其它草本豆科植物.