Bouchetia
| Bouchetia | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Bouchetia | ||||||||||||
| Dunal |
Bouchetia is a genus ofthe nightshade family . The three species occur in three disjoint areas in South and North America . The scientific generic name honors the French doctor and hobby botanist Dominique Bouchet-Doumeng (1770-1845) from Montpellier.
description
Vegetative characteristics
The Bouchetia species are semi-cryptophytic or, more rarely, cryptophytic plants with perennial, gem-forming roots . The shoot axis grows upright or prostrate-ascending and becomes 4 to 30 cm long. The endodermis lacks Casparian strips , but a starchy sheath is formed.
The leaf blades of the lower leaves are elongated-spatulate to rhombic-egg-shaped, they are usually 20 to 40 (in individual cases 10 to 50) mm long, they stand on 5 to 20 mm long petioles . The upper leaves are sessile and closely elliptical in shape.
blossoms
The flowers stand individually in the axils on 15 to 30 mm long peduncles . The 8 to 12 (rarely up to 17) mm long calyx is tubular-bell-shaped. The crown is slightly zygomorphic , 10 to 35 mm long and in the lower part, enclosed by the calyx, cylindrical, above it is funnel-shaped. Their coloring can be white, cream, lavender or purple. The coronet is five-lobed, the lobes themselves are short and wide, blunt or rounded.
Usually five stamens are formed, occasionally the shortest stamen is transformed into a sterile staminodium or is missing entirely. The stamens are of unequal length, if only four stamens are formed, there are two pairs of stamens of different lengths. They start in the lower half of the corolla tube and can be at the same height or at different heights. The anthers can have a circular circumference and then have a diameter of 0.8 to 1.2 mm, or they can be elongated and then about 0.8 mm long. The counters stand free from each other in the lower third. The pollen grains can appear individually or in tetrads. If they are single, they are relatively large with a diameter of about 41 µm. The ovary and the stylus are trimmed, the Nektarien like a sheath bilobed.
Fruits and seeds
The fruits are capsules that are shorter than the permanent calyx. Each fruit contains around 50 to 60 seeds . These are 0.7 to 0.9 (1.2) × 0.5 to 0.9 × 0.4 to 0.8 mm in size. The embryo is straight or slightly curved, the cotyledons are shorter than the rest of the embryo.
Chromosome number
The base chromosome number is .
Occurrence
Bouchetia anomala occurs in southern Brazil , Paraguay , Uruguay and in northern and central Argentina , the other two species Bouchetia arniatera and Bouchetia erecta occur in Mexico or in Mexico and Texas .
Systematics
The genus consists of only three species. The type species is Bouchetia erecta .
- Bouchetia anomala (Miers) Britton et Rusby
- Bouchetia arniatera B.L. Rob.
- Bouchetia erecta Dunal
swell
- Armando T. Hunziker: The Genera of Solanaceae . ARG Gantner Verlag KG, Ruggell, Liechtenstein 2001. ISBN 978-3904144773 .