| 单词 | Xanthium |
| 例句 | Xanthium spinosum L. Bur oblong, light brown, very slightly flattened, 10–13 mm. long, the beaks weak and small, small hooked prickles 3–4 mm. long, each bur contains two seeds. Seeds of Michigan Weeds Bulletin 260, Michigan State Agricultural College Experiment Station, Division of Botany, March, 1910 Body of the bur more than twice as long as thick; a common weed Cocklebur, Xanthium commune. 6b. The Plants of Michigan Simple Keys for the Identification of the Native Seed Plants of the State Such is the case with the mutative origin of Xanthium commune Wootoni from New Mexico and of Oenothera biennis cruciata from Holland. Species and Varieties, Their Origin by Mutation Xanthium strumarium L. Bur dark brown, oval, circular in sections 12–22 mm. long, beaks stout, nearly straight, spines about 5 mm. long, surface of burs and base of spines clothed with minute hooked prickles. Seeds of Michigan Weeds Bulletin 260, Michigan State Agricultural College Experiment Station, Division of Botany, March, 1910 The Xanthium Wootoni, above referred to, with only part of the prickles of Xanthium commune is also a very curious instance of the demonstration of the compound nature of a character. Species and Varieties, Their Origin by Mutation |
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