Luzula

Luzula DC. In J. B. A. P. de Lamarck & A. P. de Candolle, Fl. franc. (3 ed.) 3: 158. 1805. nom. cons. Type species. Luzula campestris (L.) DC. typus cons. References. Desvaux, J. Bot. (Desvaux) 1: 129-165, t.5-6. 1808; Meyer, Linnaea 22: 383 420. 1849; Buchenau, Abh. Naturwiss. Vereine Bremen 6: 413-424. 1879; Buchenau, Bot. Jahrb. Syst. 12: 74-167. 1890; Buchenau in Engler, Pflanzenreich IV, 36 (Heft 25): 42 98. 1906; Barros, Darwiniana 10: 313-358. 1953. Juncoides Mohring, Primae lin. hort. priv. 1737. Luciola Smith, Engl. fl. 2 ed. 177. 1828. Juncodes Kuntze, Revis. gen. pl. 2: 722. 1891. Kirschner et al., Juncaceae. Species Plantarum: Flora of the World 6: 1-237. 2002a. Etymology. The name Luzula is a corruption of the Latin verb lucciola for shining which refers to the shining appearance of the inflorescence which is overlain by hairs in certain species. Perennial, rhizomatous herbs, hairy at the margin of leaves and bracts. Culms erect. Leaves alternate, scale like on runners and rhizomes, foliar at the base of the culm, and bracteous in the inflorescence; sheaths closed, without auricles at the junction to the blade; blades linear to narrowly lanceolate, flat, concave or with involute margins. Inflorescence with many individually inserted flowers arranged in loose, much branched panicles or with the flowers congested into dense clusters which are then arranged in a panicle, an anthela, a raceme, or contracted into dense spike like structures. Flower perfect, subtended by a bract at the base of the pedicel and clasped by 1-2 bracteoles inserted on the pedicel just below the flower. Tepals unequal or subequal, lanceolate; margin entire, sometimes membranous or divided into ciliate lobes. Stamens 3-6; filaments filfiorm, rarely linear and flattened; anthers oblong, rarely linear. Gynoecium with sessile ovary; style short, filiform; stigmas three, filiform, twining, covered with sticky papillae. Capsule trigonous, sometimes basally 3-lobed, unilocular. Seeds three per capsule, attached to the placenta by a long delicate funicle, ellipsoid to oblong, brown to reddish brown, outer seed coat white, hyaline or light brown. Distribution and habitat. Luzula is a cosmopolitan genus of ca. 115 species, most of which occur in the north temperate region. In the tropical region the genus is totally absent in the lowlands, but present at higher elevations, mostly above 2500 meters above sea level. Tropical America has eight species of Luzula, tropical Africa three, tropical Asia one. Three species of this genus have been found in Colombia.

KEY TO THE SPECIES OF LUZULA IN COLOMBIA

1	Flowers inserted individually on visible pedicels, not in clusters or heads; inflores-cence a loose panicle. Rachis segments 5-15 cm long, the inflorescence divided into 4-5 subequal nodding panicles, one above the other.	Luzula gigantea
1'	Flowers in round or oblong heads or elongate clusters; the clusters arranged in anthelae, loose panicles, racemes, or spike like structure	2
2	Runners present; bracts of flower clusters all membranous and not exceeding the cluster; culms usually straight.	Luzula vulcanica
2'	Runners not present; bracts of at least the lower flower clusters herbaceous and exceeding the cluster; culms usually curved	Luzula racemosa

Juncaceae
Luzula gigantea
Luzula racemosa
Luzula vulcanica

Sin material de COL

Juncaceae