彩叶草(Coleus blumei Benth),又名"彩叶苏"、"洋紫苏",由于它叶色娇艳多变,一般人又叫它"老来娇"、"老来少"。它是唇形科鞘蕊花属的多年生草本花卉,常作1～2年生栽培,老株可长成亚灌木状;株高30cm～50cm,最高达90cm,分株较少,茎质柔软,成四棱形,基本木质化;叶片大,对生茎上,叶质薄,成菱状卵形,边缘有深粗锯齿,正背面有软毛,叶面绿色,杂有黄、红、紫、橙、绿等各种色彩相嵌的不规则的斑点、纹路和镶边,叶色变化多端,叶色还会随着气候变化、光照不同而改变颜色,有不少品种还出现复色、杂色,上并分布白色,故有"五彩叶草"之称。彩叶草的生长温度在20℃～25℃之间,耐寒力较差,如连续几天10℃以下即开始落叶,甚至死亡。所以北方地区应在霜降之前将植物移入室内,它必须在10℃温度以上才可越
Total yields of vine tip of seven varieties of Leaf-vegetable sweetpotato during 2006-2007 were investigated; proportions of the weights of leaf, leaf stalk and stem in total vine tip yield and their changes among varieties and during topping stages were studied. The results showed that vine tip yields of sweetpotato were significantly different among either varieties or topping stages; leaf yield accounted for about 51% of total vine yield, and changes in leaf yield among topping stages were higher than that among varieties; while yields of leaf stalk and stem each accounted for 25% of total vine tip yield, their changes among varieties were higher than those among topping stages. These results revealed the yield composition of vine tip of Leaf-vegetable sweetpotato, which provided scientific references for breeding and cultivating new Leaf-vegetable sweetpotato variety and its industrialization.
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