中药“月见草”的茎是紫色的吗？如果不是紫色，那应该是什么颜色？

紫色:/i？ct=503316480。z = 0 & amptn = baiduimagedetail & ampC3 % F7 % D4 % C2 % B2 % DD & amp；in = 9035 & ampcl = 2 & amplm=-1。pn=4。rn=1。di = 10046565540 & amp；ln = 604 & ampfr = & ampfmq = & ampic = & amps = 0 & ampse = & ampsme = 0 & amptab = & amp宽度= & amp高度= & ampface = & ampis = & ampistype = 2 # pn4 & amp-1

绿色:/i？ct=503316480。z = 0 & amptn = baiduimagedetail & ampC3 % F7 % D4 % C2 % B2 % DD & amp；in=19523。cl = 2 & amplm=-1。pn=1。rn=1。di=24277114860。ln = 604 & ampfr = & ampfmq = & ampic = & amps = 0 & ampse = & ampsme = 0 & amptab = & amp宽度= & amp高度= & ampface = & ampis = & ampistype = 2 # pn 1 & amp；-1

事实上，大多数植物是紫色和绿色的。