Amerosedum divergens

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Amerosedum divergens S.Watson

Crassulaceae

Life form: perennial

Exposure: sun   6

Moisture: moderately moist bis Moisture: moist

Soil: gritty loam

Arrangement: decussate
Leaves:

Shape: spatulate

Division: simple

Shape: five-stellate
Fruit: follicle

3A / f8da21 

Inflorescence: cyme

Petals: not specified
Habit: not specified

Growth form: not specified

Taxonomy

Divisio:
Magnoliophyta
Subdivisio:
Magnoliophytina
Classis:
Rosopsida
Subclassis:
Rosidae
Superordo:
Saxifraganae
Ordo:
Saxifragales

Amerosedum divergens is a succulent perennial.

Naming

Amerosedum divergens was already described and the name validly published by Sereno Watson. It was Áskell Löve and Doris Benta Maria Löve, however, who reclassified it into todays valid botanical systematics in 1985.

Taxonomy

Amerosedum divergens is a species in the genus Amerosedum which contains approximately 1 to 10 species and belongs to the family of the Crassulaceae (Stonecrop Family).

Characteristics

Growth

The perennials reach heights of 6 to 12 centimetres.

Leaves

Amerosedum divergens has dark-green, simple leaves that are decussate. The leaves are spatulate, entire and sessile.

Flowers and Fruits

Amerosedum divergens produces cymes of yellow five-stellate flowers from May to September.

The perennials produce follicles.

Root System

Distribution

Amerosedum divergens is native to British Columbia and the Northwest of the US.

Cultivation

The perennials prefer a sunny situation on fresh to moist soil. The substrate should be gritty loam. They tolerate temperatures down to -23°C (USDA zone 6). Under glass use loamy potting compost with added gravel.

In summer the plants prefer good ventilation.

Uses

Maintenance and Propagation

  • For healthy growth apply a compound fertilizer at 50% concentration monthly during growth.
  • Water moderately in summer, give little water in winter.

Propagation

  • Sowing seed in a cold frame in autumn
  • Cuttings in early summer
  • Division in spring


Cultivars

Poisonousness

All plant parts may cause slight discomfort if consumed. The sap may irritate the skin

Aeskulap  Please read the health issues note

Pests and Diseases

Gnaw marks and slime trails indicate a problem with slugs. Prevent infestation by improving hygiene and by regularly working the soil. In case of an infestation use slug pellets or nematodes to control pest. Handpicking the slug also helps, do this preferably in the evening hours.

Damaged roots, withering, decolouration and dieback of leaves and shoots may be caused by stagnant moisture, fungi or bacteria. Remove affected plants. Prevent by improving hygiene and drainage.

Honeydew, galls and distorted leaves are a sign for an infestation with aphids. Use an insecticide or control biologically , e.g. with parasitic wasps or predators such as Aphidoletes aphidimyza.

Scale insects that sit on the undersides of the leaves and excrete honeydew can be controlled with insecticide or biologically with parasitic wasps.

Waxy fibres and honeydew on leaves and shoots indicate an infestation with mealybugs. Apply insecticide or control biologically with predatory ladybirds.

Small dark-coloured beetles feeding on the plants are very likely vine weevils. Their larvae feed on seedling, cuttings, roots and tubers. Handpick and destroy pests and improve hygiene. Additionaly use insecticide or biological control (nematodes).

Literature

  • Walter Erhardt, Erich Götz, Nils Bödeker, Siegmund Seybold: Der große Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
  • Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.

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