Nicotiana obtusifolia
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Nicotiana obtusifolia |
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| M. Martens & Galeotti |
Nicotiana obtusifolia is a plant type from the genus tobacco ( Nicotiana ) in the family of the nightshade family (Solanaceae).
description
Nicotiana obtusifolia is a perennial , glandular hairy , 20 to 80 centimeter high plant. It is a bit woody at the base. The leaves are 2 to 10 centimeters long, in the lower part of the plant with a short stalk and ovate to inverted ovoid, towards the top they become more or less narrow ovoid and encompass the stem.
The inflorescences are accompanied by linear to lanceolate-shaped bracts , the length of which is less than 20 millimeters. The calyx is 10 to 15 millimeters long, the calyx lobes are of the same shape, narrow triangular and about as long as the calyx tube. The crown is more or less funnel-shaped, green-white or matt white. The corolla tube and throat together have a length of 15 to 26 millimeters, the coronet is 8 to 10 millimeters long. The stamens are uneven and set near the base of the corolla tube.
The fruit is an 8 to 10 millimeter long capsule .
The number of chromosomes is 2n = 24.
Distribution and locations
The species grows in the United States in the desert east of the Sierra Nevada to Utah , Texas and also in Mexico . It can be found in stony or rocky erosions at altitudes below 1,600 meters.
Systematics
Within the genus Nicotiana , Nicotiana obtusifolia is classified in the section Trigonophyllae . It is believed that about 1 million years ago the allopolyploid section Polydicliae arose from the ancestors of Nicotiana obtusifolia as the male parent and the ancestors of Nicotiana attenuata as the female parent.
proof
- ↑ a b c d Michael H. Nee: Nicotiana obtusifolia . In: Jepson Flora Project, Jepson eFlora , 2012. Retrieved September 6, 2012.
- ↑ Nicotiana obtusifolia at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ James J. Clarkson et al .: Phylogenetic relationships in Nicotiana (Solanaceae) inferred from multiple plastid DNA regions . In: Molecular Phylogenetics and Evolution , Volume 33, 2004. pp. 75-90. doi : 10.1016 / j.ympev.2004.05.002
- ↑ K. Yoong Lim et al .: Sequence of events leading to near-complete genome turnover in allopolyploid Nicotiana within five million years. In: New Phytologist , Volume 175, Issue 4, 2007. doi : 10.1111 / j.1469-8137.2007.02121.x
