Louis O. Williams
American Museum of Natural History
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Featured researches published by Louis O. Williams.
Fieldiana Botany | 1962
Louis O. Williams
Planta parva, epiphytiea; folia elliptiea, bivel triapieulata; infloreseentia uniflora; sepalum dorsale obovatum, breviter eaudato-aeuminatum, 3-nervium; sepala lateralia in laminam obovatam eonnata, eaudato-aeuminata, 5-nervia; petala oblongo-oblaneeolata, aeuminata; labellum multo minus, transverse subquadratum, trilobatum. Small creeping epiphytic plants, the rhizome slender, apparently unbranched, 10 cm long or perhaps longer, closely covered with scarious, infundibuliform, apieulate, sheathing bracts which persist for some time; stems lateral on the rhizomes, terete, unifoliate, covered with bracts like those of the rhizome, 4-5 mm long; leaves one from eaeh stem, elliptic, bior triapieulate at the apex, 15-20 mm long and 4mm broad; inflorescence subterminal on the stem, solitary; pedunele filiform, terete, with a searious, infundibuliform, apieulate braet above the middle and another subtending the single flower, usually with a short ligule (3-4 mm long) from the base of the flower; flowers solitary, greenish yellow; perianth parts all obseurely serrulate and oeellate; dorsal sepal oval or obovate, short eaudate-aeuminate, obscurely 3-nerved, about 10 mm long and 4.5 mm broad; lateral sepals eonnate into one, oval or broadly ovate, short caudate-aeuminate, 5-nerved, about 12 mm long and 6 mm broad; petals essentially oblong-laneeolate, aeuminate, subaurieulate near the base on the lower side and near the middle on the upper side; labellum very small, transversely subquadrate, trilobate with the mid-lobe retuse and the laterals somewhat falcate, with a small, transverse, furfuraeeous eallus plate near the base of the lamina, about 1.5 mm long and 2.5 mm broad when spread; ovary about 5 mm long in flower, in fruit about 10 mm long.
Economic Botany | 1964
Louis O. Williams
The pines are an important and interesting group of plants of the northern hemisphere, from the arctic circle to Nicaragua and the West Indies, to north Africa and in the Malayan region. Four of the continents have pines which, in many places, cover large areas and are often the dominant feature of the vegetation. There are perhaps about one hundred different species of pines in the world; some are shrubs no nmre than a meter tall, but most are trees. Pinus ponderosa, the Western Yellow Pine, may reach a height of 75 meters.
Brittonia | 1963
Paul C. Standley; Louis O. Williams
Alton, William. 1789. Hort. Kew. 3: 230. Bailey, F. M. 1891. Contributions to the Queensland Flora. Dept. Agr. Brisbane Bot. Bull. 3: 14. Bentham, George & Hooker, J . D . 1873. Gen. P1. 2: 357. Clausen, J. 1951. Stages in the evolution of plant species. Cornell Univ. Press, Ithaca, N . Y . Coats, Alice M. 1956. Flowers and their histories. (pp. 272-273). P i tman Publ. Corp., N . Y . Darlington, C. D. & Wylie, A . P . 1955. Chromosome atlas of flowering plants. George Allen and Unwin Ltd., London. De Candolle, A . P . 1836. Prodr. Syst. Nat. 5: 532-533, 535-536, 611, 629. Gray, Asa. 1850. Plantae Wrightianae. Smiths. Contr. Knowl. 3: 105. 1886. In S. Watson, Contributions to American botany, XIV. Proc. Amer. Acad. 22: 423. Hemsley, W . B . 1881. Biologia Centrali-Americana. Botany 2: 153. Hoffmann, O. 1894. Compositae, in Engler & Prantl . Natiirl. Pf lanzenfam. 45: 87-387. Jackson, R . C . 1959. In Documented chromosome numbers of plants. Madrofio 15: 52. Linnaeus, Carolus. 1753. Species Plantarum. ed. 1. 920.
Taxon | 1975
Louis O. Williams; Robert I. Dressler; Glenn E. Pollard
Taxon | 1977
B. L. Turner; Dorothy L. Nash; Louis O. Williams
REVISTA CEIBA | 2016
Paul C. Standley; Louis O. Williams
Archive | 1976
Dorothy L. Nash; Louis O. Williams
Taxon | 1975
Louis O. Williams
Archive | 1974
Dorothy L. Nash; Paul C. Standley; Louis O. Williams
Taxon | 1973
R. S. Cowan; Paul C. Standley; Louis O. Williams; Dorothy N. Gibson