Dietes Salisb. ex Klatt

African irises (en)

Genus

Angiosperms > Asparagales > Iridaceae

Characteristics

Medium to large, perennial, evergreen herbs with a thick, creeping rhizome, persisting for several years. Leaves several, ensiform, distichous, coriaceous, lanceolate, without a midrib. Stem usually erect, bearing leaves at lower nodes, persisting for more than one season, with sheathing leaves at the upper nodes; branching irregularly in upper half, or forming a divaricately branched panicle. Inflorescences terminal rhipidia (umbellate flower-clusters enclosed in paired opposed spathes), the spathes sheathing, coriaceous, the outer spathe smaller than the inner. Flowers several per rhipidium, pedicellate, borne serially, the pedicels pubescent above, actinomorphic, Iris-like; tepals free, all broadly unguiculate, the limbs spreading, outer tepal-claws pubescent. Filaments usually free, occasionally united below; anthers linear, appressed to the style-branch. Style dividing shortly above the base into 3 broad petaloid branches opposed to the outer tepals, each branch terminating in a pair of erect petaloid appendages (crests); stigmas transverse, abaxial, below the base of the crests. Capsules cartilaginous, often irregularly grooved or smooth, tardily dehiscent or indehiscent, erect or pendent. Seeds irregularly angled, fairly large.
More
Perennial herbs with thick, creeping rhizome. Stems erect; lower nodes leafy; upper with spathe-like bracts. Leaves basal and cauline, distichous, tough, equitant. Inflorescence a terminal panicle; bracts sheathing, subtending several flowers which open sequentially. Flowers ± actinomorphic, large. Perianth segments free, with an erect claw and an outspread limb. Filaments free or connate at base. Style branches large, flattened, petaloid, each with an transverse stigmatic flap and 2 petaloid crests. Capsule ± globose to ellipsoidal, usually ± erect. Seeds numerous, large, irregularly flattened.
Style dividing from near the base into 3 broad petaloid branches opposed to the outer tepals, each branch terminating in a pair of erect petaloid appendages (crests); stigmas transverse, abaxial, below the base of the crests.
Flowers several per rhipidium, pedicellate, borne serially, actinomorphic, Iris-like; pedicels pubescent above; tepals free, all broadly unguiculate, the limbs spreading, outer tepal claws pubescent.
Inflorescences composed of terminal rhipidia (umbellate flower clusters enclosed in paired opposed spathes); spathes sheathing, coriaceous, the outer spathe smaller than the inner.
Stem usually erect, bearing leaves at lower nodes, with sheathing leaves at the upper nodes; branching irregularly in the upper half, or forming a divaricately branched panicle.
Medium to large evergreen perennial herbs with thick creeping rhizomes, aerial parts persisting for several years.
Capsules erect or pendent, cartilaginous, irregularly grooved or smooth, tardily dehiscent or indehiscent.
Filaments usually free, occasionally united below, anthers linear, appressed to the style branches.
Leaves several, distichous, ensiform, coriaceous, without a midrib.
Seeds irregularly angled, fairly large.
Life form perennial
Growth form herb
Growth support -
Foliage retention evergreen
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) -
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Widely cultivated as ornamentals.
Uses ornamental
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 30 - 90
Germination temperacture (C°) 10 - 15
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Dietes unspecified picture

Distribution

Dietes world distribution map, present in Angola, Australia, Ethiopia, Jamaica, Kenya, Mozambique, Mauritius, Norfolk Island, Réunion, eSwatini, Tanzania, United Republic of, Uganda, Zambia, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:331187-2
WFO ID wfo-4000011690
COL ID 8VWXX
BDTFX ID -
INPN ID 446215
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Dietes

Lower taxons

Dietes butcheriana Dietes bicolor Dietes robinsoniana Dietes iridifolia Dietes flavida Dietes grandiflora Dietes iridioides