Awl cresses

Awl cresses
	Witchcress ( Subularia aquatica ), illustration
Systematics
	Rosids
	Eurosiden II
Order :	Cruciferous (Brassicales)
Family :	Cruciferous vegetables (Brassicaceae)
Tribe :	Cardamineae
Genre :	Awl cresses
Scientific name
	Subularia
	L.

Pfriemenkressen ( Subularia ) are a very small genus of the cruciferous family (Brassicaceae). The only two species occur in littoral and aquatic habitats.

description

Vegetative characteristics

Subularia species grow as annual herbaceous plants and, depending on the species, reach heights of between 1.5 and 16.0 centimeters. They can be found in bank or water areas (littoral or aquatic). All parts of the plant are bare. The stems are erect and unbranched.

The durable leaves, which are only arranged in basal rosettes and not distributed on the stem, are seated , i.e. designed without a petiole. The simple leaf blade is sub-like , which is where the genus name is derived. The leaf margins are entire .

Generative characteristics

The flowers of the Subularia species are grouped in loose or somewhat denser, grape-like inflorescences that slightly to significantly elongate until fruit ripe . The flower stalks are usually ascending, rarely bulky, spreading or almost upright and elongate slightly or considerably until the seed is formed.

The hermaphroditic flowers have a double flower envelope . The green, oval-elongated sepals are ascending to erect. The seldom missing petals are white, narrow, lanceolate to tongue-shaped and slightly larger than the sepals. The stamens are designed almost the same; their stamens show no widening basal and the anthers are egg-shaped. The confluent nectar glands sit opposite the base of the stamens. There are 4 to 18 ovules per ovary present. A stylus is missing and the scar has a head shape.

The short-stalked, smooth pods have an obovate to ellipsoidal or stem-round and cylindrical shape. The valves are veinless; the placental frame (replum) is rounded and the septum (septum) is completely formed. The seeds , lying in two rows, are slightly compressed, elongated and not winged. If the seed coat is moist, it will not become sticky.

The number of chromosomes is x = 14, 15.

Systematics and distribution

The genus Subularia was 1753 Linnaeus in Species Plantarum , 2, p 642 first published . It belongs to the tribe Cardamineae in the family Brassicaceae . The genus name Subularia is derived from the Latin word subula for awl or awl and refers to the leaf shape of the type species Subularia aquatica L.

The genus Subularia contains only two species:

Weave cress ( Subularia aquatica L. ): With two varieties:
- Subularia aquatica var. Aquatica in Greenland and northern Eurasia including Russia with foothills to the Pyrenees and the mountains in Bulgaria .
- Subularia aquatica var. Americana (GAMulligan & Calder) B. Boivin in much of North America .
Subularia monticola A.Br. ex Schweinf. : Their home is in tropical Africa in highland rainforests, moors, ericoid and alpine altitudes at altitudes between 2750 and 4750 meters. It forms mats on permanently moist ground or, less often, grows submerged in ponds.

swell

Ihsan A. Al-Shehbaz: Subularia Linnaeus. In: Flora of North America. www.eFloras.org, accessed on November 25, 2010 (English). Volume 7, 2010 p. 509. (Section Description)

Individual evidence

↑ Species: Subularia aquatica L., awlwort . Notes on size specifications for Subularia . (No longer available online.) Department of Ecology, State of Washington, archived from the original on July 30, 2010 ; accessed on November 27, 2010 (English). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2
↑ ^a ^b Subularia monticola A.Br. ex Schweinf. Indications of the type and size of Subularia . In: African Plant Database. CJB-Conservatoire et Jardin Botanique, Ville de Geneve, accessed on November 16, 2010 .
↑ First publication scanned at biodiversitylibrary.org.
^ ^A ^b Subularia in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
↑ Subularia aquatica L. Reference to the European distribution of Subularia → Flora Europaea Search Results for Distribution. Royal Botanic Garden Edinburgh, accessed November 16, 2010 .
↑ Subularia aquatica L. PLANTS Profiles as indications of the distribution of Subularia . In: Plants Database. NRCS-National Resources Conservation Service, US Department of Agriculture, USDA, accessed November 16, 2010 .

Web links

Commons : Awlenkressen ( Subularia ) - Collection of images, videos, and audio files

[ecy-1] Species: Subularia aquatica L., awlwort . Notes on size specifications for Subularia . (No longer available online.) Department of Ecology, State of Washington, archived from the original on July 30, 2010 ; accessed on November 27, 2010 (English). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2

[cjb-2] Subularia monticola A.Br. ex Schweinf. Indications of the type and size of Subularia . In: African Plant Database. CJB-Conservatoire et Jardin Botanique, Ville de Geneve, accessed on November 16, 2010 .

[biodiversitylibrary-3] First publication scanned at biodiversitylibrary.org.

[GRIN-4] A ^b Subularia in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.

[FlEur-5] Subularia aquatica L. Reference to the European distribution of Subularia → Flora Europaea Search Results for Distribution. Royal Botanic Garden Edinburgh, accessed November 16, 2010 .

[USDA-6] Subularia aquatica L. PLANTS Profiles as indications of the distribution of Subularia . In: Plants Database. NRCS-National Resources Conservation Service, US Department of Agriculture, USDA, accessed November 16, 2010 .