Home Iridaceae of sub-Saharan Africa
Genera
Species
Iridaceae in sub-Saharan Africa
Photo Gallery
Geographic Search
References
Search Builder
About this project
!Tritonia dubia Eckl. ex Klatt 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: Linnaea 32: 761. 1864. (Linnaea) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 10/13/2016)
Acceptance : Accepted
Taxon Profile     (Last Modified On 10/14/2016)
Description: Plants 120–200(–300) mm high. Corm subglobose, 8–20 mm diam., with cormlets at base and in lower leaf axils; tunics of fine fibres. Stem erect, simple or up to 3-branched from near base. Leaves 5–8, suberect to falcate, lanceolate-ensiform, 40–150 × 3–7 mm, acute, with evident main vein, cauline leaves bract-like and often dry. Spike erect, subsecund, (3)5–10-flowered; bracts dry and papery, whitish or flushed pink but brown and densely speckled with rusty brown distally and on upper margins, outer 5–10 mm long, obtuse or 3-to irregularly-toothed, inner subequal or slightly shorter, bifid. Flowers actinomorphic, rotate, pale orange or salmon-pink to red, with dark veins and yellow tube; perianth tube funnel-shaped, 6–10 mm long, ± filiform below widening in upper 2–3 mm to ± 3 mm diam.; tepals subequal spreading, elliptic, obtuse, 10–15(–20) × 4–6(–8) mm, without calluses. Filaments central and erect, 3–5 mm long, reaching < halfway up perianth; anthers 3–4.5 mm long, pale yellow; pollen yellow. Style 7–8 mm long, dividing below or opposite base of anthers, branches 3–5 mm long. Capsules elongate-ellipsoid, trigonous, 15–20(–25) × 5–6 mm, exserted beyond bracts. Flowering time: (July) August to September.
Country: South Africa
South African Province: Eastern Cape
Distribution and ecology: a local endemic in southern Eastern Cape between Hankey and Paterson; in grassy fynbos and grassy clearings in thicket.
Diagnosis: unique in the genus Tritonia dubia has perfectly radially symmetric flowers with erect, centrally placed stamens surrounding the style. The stamens are inserted near the top of the perianth tube which thus widens only in the upper 2–3 mm. In other species with a regular perianth the stamens are inserted in the lower half of the tube and the flowers thus have a prominent gullet. Plants appear to set seed readily and completely, and are thus evidently autogamous, an observation consistent with the branching of the style below the anthers where the stigmas will become dusted with self pollen. The capsules are unusually large and elongate for the genus, ellipsoid and 15–25 mm long, quite unlike the short capsules included in the bracts of other species in sect. Tritonia. The floral symmetry and structure and capsule size and shape suggest our placing of T. dubia in sect. Montbretia near T. laxifolia which has similar capsules, rather than the earlier assignment to sect. Tritonia.

 
 
© 2024 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110