| 单词 | Hieracium |
| 例句 | It is only necessary to see the victory of such drought-resisting weeds as Hieracium pilosella, Plantains, Hypochaeris, on lawns to realise how weeds may win in the struggle for existence with the finer grasses. Disease in Plants 2012-03-01T03:00:22Z Hieracium Pilosella L. Flowers yellow; achenes jet black, oblong, straight or curved, apex truncate, base abruptly pointed, cylindrical or narrowly oval, the sides bearing 10 narrow vertical ridges. Seeds of Michigan Weeds Bulletin 260, Michigan State Agricultural College Experiment Station, Division of Botany, March, 1910 After seventeen years of work by himself and son, especially upon several species of Hieracium, he satisfied himself that his theory was true to the facts. A Mechanico-Physiological Theory of Organic Evolution There was a complete absence of that segregation of characters which he had shown to exist in peas and beans, and had probably looked forward with some confidence to finding in Hieracium. Mendelism Third Edition In short, what difficulties do not arise in the study and in the determination of species in the genera Lichena, Fucus, Carex, Poa, Piper, Euphorbia, Erica, Hieracium, Solanum, Geranium, Mimosa, etc., etc.? Lamarck, the Founder of Evolution His Life and Work Orange or Tawny Hawkweed; Golden Mouse-ear Hawkweed; Devil's Paint-brush Hieracium aurantiacum Flower-heads—Reddish orange; 1 in. across or less, the 5-toothed rays overlapping in several series; several heads on short peduncles in a terminal cluster. Wild Flowers Worth Knowing Among the systematists who tested plants in this way, Nageli especially, directed his attention to the hawkweeds or Hieracium. Species and Varieties, Their Origin by Mutation Hieracium pilosella, mouse-ear hawkweed, opens at 8, closes at 2. The Botanic Garden. Part II. Containing the Loves of the Plants. a Poem. With Philosophical Notes. The variability of these shells is quite astonishing, and seems to exceed that of Rubus or Hieracium amongst plants. More Letters of Charles Darwin — Volume 1 We may instance Rubus, Rosa, and Hieracium among plants, several genera of insects, and of Brachiopod shells. The Origin of Species by means of Natural Selection, 6th Edition The production of a species out of a chaos of varying forms reminds me of Nageli's conclusion, as deduced from the study of Hieracium, that this is the common mode in which species arise. More Letters of Charles Darwin — Volume 1 One of them is the hawkweed or Hieracium, and the other is the dandelion or Taraxacum officinale. Species and Varieties, Their Origin by Mutation |
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