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Aristea dichotoma (Thunb.) Ker Gawl. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenAfrican Plants, Senckenberg Photo GallerySearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font
 

Published In: Iridearum Genera 13. (Irid. Gen.) Name publication detail
 

Project Name Data (Last Modified On 6/6/2016)
Acceptance : Accepted
Taxon Profile     (Last Modified On 6/10/2016)
Description: Plants 150–300 mm high, forming low, rounded cushions. Stems flattened below and 2-winged, dichotomously 3–6-branched. Leaves linear, 1.5–3 mm wide, grey-glaucous, firm. Flower clusters mostly 4–6, stalked, each 2–4-flowered; spathes and bracts dry, brown with broad, translucent margins, spathes 8–10 mm long, bracts ± as long or slightly longer. Flowers subsessile, blue, tepals obovate, 14–18 mm long. Filaments ± 5 mm long; anthers ± 2.5 mm long. Syle 7–8 mm long, stigmatic lobes broad, prominently fringed. Capsules on pedicels 3–4 mm long, narrowly 3-winged, 8–10 mm long. Seeds lamellate, kidney-shaped, 2 per locule, with foveate sculpturing, margins papillate. Flowering time: Dec.–Mar.
Country: South Africa
South African Province: Northern Cape, Western Cape
Distribution and ecology: western South Africa extending from Port Nolloth in Northern Cape to the Cape Peninsula and Swellendam in Western Cape; on well drained, sandy lower mountain slopes and plateaus and coastal flats.
Diagnosis: the cushion-like habit, tuft of narrow basal leaves, and dichotomously branching stem make Aristea dichotoma easy to recognize. When dry it can be confused with closely related A. glauca. The two species have similar spathes and bracts with a broad translucent margins distinct species but A. glauca does not normally forming cushions, the stems are simple or 1–few-branched and obviously flattened and 2-winged below the flower clusters, whereas stems of A. dichotoma are narrower and obscurely winged. Flowers of A. glauca are deep blue and larger, with tepals 16–20 mm long whereas tepals of A. dichotoma are paler blue and typically 14–16 mm long. The two species have partially overlapping ranges and are sometimes sympatric and co-blooming, as at sites in the Cape Peninsula and then their differences become quite clear.

 


 

Specimens whose coordinates are enclosed in square brackets [ ] have been mapped to a standard reference mark based on political units.
 
 
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