Herbs annual, subshrublike, 0.5-2(-4) m tall, usually procumbent, sometimes scandent, most parts sparsely villous and aculeate, prickles retrorsely curved.

• 一年生草本，亚灌木状，0.；5-2(-4)米高，通常平卧的，有时攀缘，多数部分疏生长柔毛和具皮刺，皮刺弄弯。