Halothamnus beckettii

Halothamnus beckettii
Halothamnus beckettii
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Core eudicots
Order:	Caryophyllales
Family:	Amaranthaceae
Subfamily:	Salsoloideae
Genus:	Halothamnus
Section:	Pungentifolia
Species:	H. beckettii
Binomial name
Halothamnus beckettii Botsch.

Halothamnus beckettii is a species of the plant genus Halothamnus, that is now included into the family Amaranthaceae, (formerly Chenopodiaceae). It is the only member of the section H. sect.Pungentifolia, which differs from H. sect. Halothamnus by hard leaves with spiny apex. It is endemic in Somalia.^[1]

Morphology

Halothamnus beckettii is a sub-shrub only 20–40 cm high, strongly branched and densely foliated. The whole surface of the plant is covered with small white pustules. The half-terete leaves with concave upper side are narrowly triangular, with dense tufts of long curly hairs in their axils, about 11 mm long, and with a cartilaginous spiny apex. The flowers are 7,5-8,5 mm long (longer than other Halothamnus species). The winged fruit is 11–13 mm in diameter, their wings inserting at 1/5 of the fruit height, the tepal lobes with prominent mid rib.^[1]

• 

  fruit (lateral view)

Anatomy

The leaf anatomy of Halothamnus beckettii is unique in this genus: the peripheral bundles at the inside of the layer of Kranz-cells contain extreme amounts of lignified tissue.^[2]

Distribution

Halothamnus beckettii is endemic in Somalia. It is a rare species, known just from a few sites. I grows in dry places (with yearly precipitation of 100-200 mm) among scattered dwarf shrubs or grasses on plateaus or slopes, on limestone or silty sand, up to 700 m.^[1]

Systematics

Halothamnus beckettii has been first described in 1982 by Victor Petrovič Botschantzev (In: Bot. Žurn. (Moscow) 67(4), 1982, p.545).^[3] The species name refers to the collector of the type specimen, J.J. Beckett. The species has been accepted in "Flora of Somalia" (Vol.1, 1993)^[4]

References

1. Gabriele Kothe-Heinrich: Revision der Gattung Halothamnus (Chenopodiaceae). Bibliotheca Botanica Bd. 143, Schweizerbart, Stuttgart 1993, ISBN 978-3-510-48014-2, p. 46-49.
2. Gabriele Kothe-Heinrich: Revision der Gattung Halothamnus (Chenopodiaceae). Bibliotheca Botanica Bd. 143, Schweizerbart, Stuttgart 1993, ISBN 978-3-510-48014-2, p.16-18.
3. Botschantzev, V.P.: Novyj vid roda Halothamnus (Chenopodiaceae) iz Somalia. - Bot. Žurn. (Moscow) 67(4), 1982, p. 545.
4. Entry for Halothamnus beckettii at JSTOR

External links

• Schweizerbart Bibliotheca Botanica Bd. 143 Webpage
• Type and Isotype of Halothamnus beckettii at JSTOR