Code
KOASE
Growth form
Broadleaf
Biological cycle
Annual
Habitat
Terrestrial
KOASE
Growth form
Broadleaf
Biological cycle
Annual
Habitat
Terrestrial
🗒 Synonyms
| synonym | Duvaucellia tenuis Bowdich |
| synonym | Hedyotis grandiflora A.Rich. |
| synonym | Hedyotis senegalensis (Cham. & Schltdl.) Steud. |
| synonym | Knoxia senegalensis (Cham. & Schltdl.) Rchb. ex Oliv. |
| synonym | Kohautia noctiflora Hochst. ex A.Rich. |
| synonym | Kohautia senegalensis Cham. & Schltdl. |
| synonym | Oldenlandia garuensis K.Krause |
| synonym | Oldenlandia noctiflora (Hochst. ex A.Rich.) Hiern |
| synonym | Oldenlandia senegalensis (Cham. & Schltdl.) Hiern |
🗒 Common Names
| No Data |
📚 Overview
Description
There is content in another language. Please click here to read it. (Français)
Global description
Kohautia tenuis is a plant erect and hairless. The leaves are opposite and decussed, linear and sessile, presenting a stipulated toothed collar. The flowers, pink in color, are solitary, arranged in cyme bipare. They are long pedicelled. They include 4 welded sepals, surmounted by a point and 4 petals welded into a long tube surmounted by 4 apiculate lobes. The fruit is a dehiscent capsule, containing many pyramidal seeds.
Cotyledons
The cotyledons are very small. They are obovate in shape and 2 mm long. They are sessile.
First leaves
The first leaves are opposite. They are sessile. The blade is linear, 1 to 3 cm long and 1 to 2 mm wide. The bases of the leaves are connected by a stipular collar presenting 1 or 2 filiform teeth. The stem is quadrangular. The stem and leaves are hairless.
General habit
Kohautia tenuis is erect. The plant is abundantly branched in the upper part. It measures 30 to 90 cm in height.
Underground system
The root is a taproot.
Stem
The stem is quadrangular and solid. The four faces are usually marked by a narrow median groove. The stem is totally hairless.
Leaf
The leaves are opposite and decussed. They are sessile. The bases of the leaves of each pair are connected by a stipular collar surmounted by 1 to 3 teeth of 2 mm long. The blade is linear, 3 to 5 cm long and 2 to 3 mm wide. The base is attenuated and the top is in acute corner. Both sides are glabrous. The margin is entire. It has a few short teeth at the base and then becomes smooth.
Flower
The flowers are solitary, arranged in a diffuse inflorescence type cyme bipare. They are borne by a filiform pedicel, 2 to 10 mm long. The calyx is short, consisting of 4 sepals welded at the base and topped by a linear tooth, acute, 1.5 mm long during fruiting. The corolla is formed of 4 petals welded into a long tube of 10 mm, terminated by 4 lobes elliptic to linear, 3 mm long and 2 mm wide, apiculated apex. The corolla is pale pink to dark pink. The style is in the lower half of the corolla tube and the stamens in the upper half. The ovary is inferior, bilocular, with numerous ovules.
Fruit
The fruit is a dehiscent capsule of globular form. It is included in the chalice and surmounted by the 4 teeth of it. It is carried by a pedicel 10 to 32 mm long. The dehiscence line is a small slit at the top of the capsule. It is 2.5 to 3 mm in diameter and contains numerous agglomerated seeds.
Seed
The seeds are pyramidal, 0.2 mm long. The tegument is black in color.
Kohautia tenuis is a plant erect and hairless. The leaves are opposite and decussed, linear and sessile, presenting a stipulated toothed collar. The flowers, pink in color, are solitary, arranged in cyme bipare. They are long pedicelled. They include 4 welded sepals, surmounted by a point and 4 petals welded into a long tube surmounted by 4 apiculate lobes. The fruit is a dehiscent capsule, containing many pyramidal seeds.
Cotyledons
The cotyledons are very small. They are obovate in shape and 2 mm long. They are sessile.
First leaves
The first leaves are opposite. They are sessile. The blade is linear, 1 to 3 cm long and 1 to 2 mm wide. The bases of the leaves are connected by a stipular collar presenting 1 or 2 filiform teeth. The stem is quadrangular. The stem and leaves are hairless.
General habit
Kohautia tenuis is erect. The plant is abundantly branched in the upper part. It measures 30 to 90 cm in height.
Underground system
The root is a taproot.
Stem
The stem is quadrangular and solid. The four faces are usually marked by a narrow median groove. The stem is totally hairless.
Leaf
The leaves are opposite and decussed. They are sessile. The bases of the leaves of each pair are connected by a stipular collar surmounted by 1 to 3 teeth of 2 mm long. The blade is linear, 3 to 5 cm long and 2 to 3 mm wide. The base is attenuated and the top is in acute corner. Both sides are glabrous. The margin is entire. It has a few short teeth at the base and then becomes smooth.
Flower
The flowers are solitary, arranged in a diffuse inflorescence type cyme bipare. They are borne by a filiform pedicel, 2 to 10 mm long. The calyx is short, consisting of 4 sepals welded at the base and topped by a linear tooth, acute, 1.5 mm long during fruiting. The corolla is formed of 4 petals welded into a long tube of 10 mm, terminated by 4 lobes elliptic to linear, 3 mm long and 2 mm wide, apiculated apex. The corolla is pale pink to dark pink. The style is in the lower half of the corolla tube and the stamens in the upper half. The ovary is inferior, bilocular, with numerous ovules.
Fruit
The fruit is a dehiscent capsule of globular form. It is included in the chalice and surmounted by the 4 teeth of it. It is carried by a pedicel 10 to 32 mm long. The dehiscence line is a small slit at the top of the capsule. It is 2.5 to 3 mm in diameter and contains numerous agglomerated seeds.
Seed
The seeds are pyramidal, 0.2 mm long. The tegument is black in color.
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
No Data
📚 Nomenclature and Classification
No Data
📚 Natural History
Life Cycle
Northern Cameroon: Kohautia tenuis is a species present in the middle and at the end of the crop cycle. Germination occurs in July when rains are abundant and the soil is very humid. The first flowers bloom in September and the first fruits are formed 2 weeks later. Flowering is very spread over time, due to the cyme inflorescence. The development cycle ends at the beginning of the dry season (January) with the drying of the plant.
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
Look Alikes
Kohautia tenuis can be confused with K. grandiflora de Candolle. At the time of fruiting, the latter is distinguished by a more compact, corymbose inflorescence, broad corolla lobes (3 to 6 mm) and very short pedicels (1 to 3 mm).
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
Ecology
Northern Cameroon: Kohautia tenuis develops from the Sahelo-Sudanian zone to the Sudanian zone. This species grows mainly on heavy soils with high clay content such as fersialitic soils and vertic soils. It is also found on well-structured ferruginous soils or in wetter bottomlands. It is a ruderal species common in vacant plots and along roads. It is also a weed of annual crops. It is usually found in recently cleared or fallow plots.
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
No Data
📚 Habitat and Distribution
Description
Worldwide distribution
Kohautia tenuis is widespread in tropical Africa, from Cape Verde to Ethiopia.
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
No Data
📚 Occurrence
No Data
📚 Demography and Conservation
Risk Statement
Local harmfulness
Northern Cameroon: Kohautia tenuis remains a minor weed, present in 5 to 10% of cultivated plots and never abundant.
Northern Cameroon: Kohautia tenuis remains a minor weed, present in 5 to 10% of cultivated plots and never abundant.
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
No Data
📚 Uses and Management
📚 Information Listing
Global Biodiversity Information Facility (GBIF)
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
There is content in another language. Please click here to read it. (Français)
References
- Le Bourgeois, T. and H. Merlier (1995). Adventrop - Les adventices d'Afrique soudano-sahélienne. Montpellier, France, Cirad.637p.
- Hutchinson J., Dalziel J. M., Keay R. W. J. & Hepper F. N., 1963. Flora of West Tropical Africa. Vol. II. 2ème éd. The Whitefriars Press ed., London & Tonbridge, 544p.
- Berhaut J., 1967. Flore du Sénégal. 2ème éd. Clairafrique éd., Dakar, Sénégal, 485p.
- Le Bourgeois Th., 1993. Les mauvaises herbes dans la rotation cotonnière au Nord-Cameroun (Afrique) - Amplitude d'habitat et degré d'infestation - Cycle de développement. Thèse USTL Montpellier II, Montpellier, France, 241p.
Information Listing > References
- Le Bourgeois, T. and H. Merlier (1995). Adventrop - Les adventices d'Afrique soudano-sahélienne. Montpellier, France, Cirad.637p.
- Hutchinson J., Dalziel J. M., Keay R. W. J. & Hepper F. N., 1963. Flora of West Tropical Africa. Vol. II. 2ème éd. The Whitefriars Press ed., London & Tonbridge, 544p.
- Berhaut J., 1967. Flore du Sénégal. 2ème éd. Clairafrique éd., Dakar, Sénégal, 485p.
- Le Bourgeois Th., 1993. Les mauvaises herbes dans la rotation cotonnière au Nord-Cameroun (Afrique) - Amplitude d'habitat et degré d'infestation - Cycle de développement. Thèse USTL Montpellier II, Montpellier, France, 241p.
Images
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Herbarium pictures ReCOLNAT:
https://explore.recolnat.org/search/botanique/simplequery=Kohautia%2520tenuis
Thomas Le Bourgeois
| Attributions | |
| Contributors | |
| Status | UNDER_CREATION |
| Licenses | CC_BY |
| References |
No Data
🐾 Taxonomy
| Root | Root |
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Gentianales |
| Family | Rubiaceae |
| Genus | Kohautia |
| Species | Kohautia tenuis (Bowdich) Mabb. |
📊 Temporal Distribution
📷 Related Observations
