Boraginaceae

Cystostemon Balf.f.

First published in Proc. Roy. Soc. Edinburgh 12: 82 (1883)
This genus is accepted
The native range of this genus is Tropical Africa to Arabian Peninsula.

Descriptions

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Herbs or subshrubs
Morphology Leaves
Leaves alternate, entire
Morphology Reproductive morphology Flowers
Flowers regular or almost so, in terminal cymes or panicles of cymes
Morphology Reproductive morphology Flowers Calyx
Calyx deeply 5-lobed, sometimes enlarged in fruit
Morphology Reproductive morphology Flowers Corolla
Corolla-tube short, without scales in throat; lobes 5, usually much longer than the tube, spreading
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5, inserted in the corolla-tube; filaments short, sometimes inflated, with a basal triangular or oblong appendage that is sometimes reduced or a thickened ciliate ridge only; anthers linear, with terminal linear appendages coherent along their margins and not twisted
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 4-lobed; style gynobasic, filiform; stigma capitate
Morphology Reproductive morphology Fruits
Fruit of 1–4 3-angled or pyramidal nutlets, warty, with a basal areole.
Distribution
Genus of 16 species, nine in the Horn of Africa region, the others in south-central tropical Africa.
[FSOM]

Boraginaceae, B. Verdcourt. Flora of Tropical East Africa. 1991

Morphology General Habit
Canescent herbs or subshrubs, setose-hispid with simple hairs
Morphology Leaves
Leaves alternate
Morphology Reproductive morphology Flowers
Flowers pedicellate in terminal scorpioid cymes or panicles of cymes; bracts small, the lowest leafy
Morphology Reproductive morphology Flowers Calyx
Calyx divided almost to the base into 5 ± non-accrescent linear-ovate lobes
Morphology Reproductive morphology Flowers Corolla
Corolla mauve, blue or green, campanulate, broadened above the insertion of the stamens, widened and naked at the throat; lobes 5, usually much longer than the tube, ovate, acuminate, imbricate, spreading and revolute after flowering
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5, inserted about the middle or near base of tube; filaments short, linear, narrowly ellipsoid or round, sometimes inflated, with a basal triangular or oblong appendage, sometimes reduced or represented by thickened ciliate ridges; anthers linear, with elongate aristate terminal thong-shaped appendages longer than the anther-thecae and coherent along their margins, not twisted
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 4-lobed; style gynobasic, filiform; stigma capitate
Morphology Reproductive morphology Fruits
Nutlets 1–4, 3-angled or pyramidal, erect, acute, angular, verrucose with basal areole, dorsally keeled
Morphology Reproductive morphology Seeds
Seed straight; embryo straight with thick ovate plano-convex cotyledons; radicle superior.
[FTEA]

Boraginaceae, E. S. Martins (Trichodesma by R. K. Brummit). Flora Zambesiaca 7:4. 1990

Morphology General Habit
Annual or perennial herbs or subshrubs.
Morphology Leaves
Leaves alternate, entire.
Morphology Reproductive morphology Inflorescences
Inflorescence a large panicle or, in species outside Flora Zambesiaca area, simple or few-flowered.
Morphology Reproductive morphology Flowers Calyx
Calyx 5-lobed, divided almost to the base, sometimes accrescent in fruit.
Morphology Reproductive morphology Flowers Corolla
Corolla tube short, cylindrical or slightly funnel-shaped, without scales in throat; lobes 5, usually much longer than the tube.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5, inserted on the corolla tube; filaments short, oblong or, in species outside Flora Zambesiaca area, swollen and narrowly elliptic to round, with a basal ciliate or hairy appendage; anthers much longer than filaments, prolonged above the thecae by laminar appendages, straight, not twisted, coherent along their margins.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 4-lobed; style gynobasic, elongated; stigma capitate, small.
Morphology Reproductive morphology Fruits
Fruit of 1–4 nutlets attached to the flat gynobase only by the base.
[FZ]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of Somalia

    • Flora of Somalia
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0