Subularia

Subularia aquatica

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

• 3.1 Notes and references

Description

Vegetative characteristics

Subularia species grow as annuals and herbaceous plants reach depending on plant height between 1.5 to 16.0 centimeters. They are found in riparian areas or waters ( littoral or aquatic). All plant parts are bare. The stems are erect and unbranched.

The bodies distributed only in basal rosettes, not the stalks, tough leaves are sessile, so designed without petiole. The simple leaf blade is subulate, whence derives also the generic name. The leaf margins are entire.

Generative features

The flowers at the Subularia species stand together in loose or something denser, slightly to significantly lengthening to fruit maturity racemose inflorescences. The flower stalks usually appear in ascending, rarely sparrig, straddling or almost upright and extend slightly or significantly to seed formation.

The hermaphrodite flowers have a double perianth. The green, ovate - oblong sepals are ascending to erect. The rare lack petals are white, narrow - lanceolate to ligulate wrong and slightly larger than the sepals. The stamens are designed almost the same; their stamens basally show no broadening and the anthers are ovate. The confluent nectar glands sit against the base of the stamens. There are 4 to 18 ovules per ovary present. A stylus is missing and the scar has a kopfige shape.

The short- stalked, smooth pods have a wrong - ovoid to ellipsoidal or stalk round and cylindrical shape. The flaps are without venation; the placenta - frame ( Replum ) is round and the septum (septum ) fully formed. The seeds lying in two rows are slightly compressed, oblong and not winged. If the seed coat is wet it will not zähschleimig.

The chromosome number is x = 14, 15

Systematics and distribution

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

The genus contains only two species Subularia:

• Subularia aquatica L.: With two varieties: Subularia aquatica L. 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,

Swell

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