Streptanthella is a monotypic genus of flowering plants in the family Brassicaceae containing the single species Streptanthella longirostris, which is known by the common name longbeak streptanthella,[1] or simply streptanthella. It is native to western North America, where it occurs throughout the western United States and the northwestern states of Mexico. It grows in many types of habitat, including deserts, sagebrush, foothill woodlands, sandy flats, chaparral, and scrubby canyons. It is an annual herb producing a slender, erect, multibranched stem up to half a meter tall. The lower leaves are lance-shaped with a toothed or smooth edge and leaves higher on the plant are narrower, linear in shape, and less often toothed. The top of the stem is occupied by a long inflorescence which is an open raceme of many flowers. The top of the inflorescence bears the newest buds which are often purple in color. More mature flowers stud the stem at intervals below, each on a short pedicel. Flowers measure under a centimeter long. Each flower is enclosed in four thick sepals. At the tip are the spoon-shaped petals which are white to yellow with purple veining. The fruit is a long, dangling silique up to 7 centimeters in length containing flat, winged seeds.
Streptanthella is a monotypic genus of flowering plants in the family Brassicaceae containing the single species Streptanthella longirostris, which is known by the common name longbeak streptanthella, or simply streptanthella. It is native to western North America, where it occurs throughout the western United States and the northwestern states of Mexico. It grows in many types of habitat, including deserts, sagebrush, foothill woodlands, sandy flats, chaparral, and scrubby canyons. It is an annual herb producing a slender, erect, multibranched stem up to half a meter tall. The lower leaves are lance-shaped with a toothed or smooth edge and leaves higher on the plant are narrower, linear in shape, and less often toothed. The top of the stem is occupied by a long inflorescence which is an open raceme of many flowers. The top of the inflorescence bears the newest buds which are often purple in color. More mature flowers stud the stem at intervals below, each on a short pedicel. Flowers measure under a centimeter long. Each flower is enclosed in four thick sepals. At the tip are the spoon-shaped petals which are white to yellow with purple veining. The fruit is a long, dangling silique up to 7 centimeters in length containing flat, winged seeds.
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Streptanthella es un género monotípico de plantas fanerógamas perteneciente a la familia Brassicaceae. Su única especie: Streptanthella longirostris, es originaria de Norteamérica.
Son hierbas anuales, glabra en todas partes, a menudo glauca. Tallos de (1.2-) 2-6 (-7.5) dm de altura, erecta, a menudo con varias ramas ascendentes anteriores, rara vez son simples. Las hojas basales no rosuladas, pronto se marchitan; las caulinarias inferiores, lanceoladas a oblanceoladas, de 2 - 5.5 × 0,3 - 1 completas o dentadas a sinuadas o pinnatífidas, atenuadas en la base del pecíolo; las caulinarias superiores lineales, de 1.7 - 5.8 cm × 1.5 - 4 mm, sésiles, cuneiforme de base para atenuada, margen entero, ápice obtuso a agudo. La inflorescencia en racimos laxos y alargados considerablemente en la fruta; sépalos oblongo; pétalos de color blanco o amarillo, a menudo con venas violáceas, espatulados, (3.5-) 4-6 (-7) × 0.7-1.1 mm, crispados; garras oblanceolados, más larga que la lámina, 3 - 5 mm ; filamentos más largos de 3-6 mm, por lo menos el par dorsal exerto; anteras ovadas a oblongas, 0.5-1 (- 1.3) . mm Fruta lineal, (2.5-) 3.5-6 (-7) cm × 1.5-2 (-2.2) mm, formando una punta indehiscente a menudo contienen 1 semilla de color marrón claro, oblongas, de 2-3 x 1 - 1 0,7 (-2) mm; ala 0.3- 0.7 mm de ancho . Tiene un número de cromosomas de 2 n = 28. Floración (dependiendo de la elevación y latitud): principios de enero y finales junio
Se encuentra en los bordes de caminos, suelos de granito descompuesto, crestas arenosas, abanicos aluviales, en desiertos con artemisa y jarilla, laderas secas, suelos lavados de chaparral, secos, zonas rocosas, zonas piñoneros con enebro, en afloramientos de grava y piedra arenisca, colinas de piedra arenisca y acantilados, a una altura de 60-2200 m.
Se distribuye por México (Baja California, Sonora) y Estados Unidos.
Streptanthella longirostris fue descrita por (S.Watson) Rydb. y publicado en Flora of the Rocky Mountains 1062. 1917.[1]
Streptanthella es un género monotípico de plantas fanerógamas perteneciente a la familia Brassicaceae. Su única especie: Streptanthella longirostris, es originaria de Norteamérica.
Streptanthella é um género botânico pertencente à família Brassicaceae[1].
Streptanthella é um género botânico pertencente à família Brassicaceae.
Streptanthella longirostris là một loài thực vật có hoa trong họ Cải. Loài này được (S. Watson) Rydb. miêu tả khoa học đầu tiên năm 1917.[1]
Streptanthella longirostris là một loài thực vật có hoa trong họ Cải. Loài này được (S. Watson) Rydb. miêu tả khoa học đầu tiên năm 1917.
