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This species is accepted, and its native range is W. Tanzania.
A specimen from Kew's Herbarium

[FTEA]

Lamiaceae (Labiatae), A.J. Paton, G. Bramley, O. Ryding, R.M. Polhill, Y.B. Harvey, M. Iwarsson, F. Willis, P.B. Phillipson, K. Balkwill, C.W. Lukhoba, D.F. Otieno, & R.M. Harley. Pycnostachys, G Bramleyshaped. Flora of Tropical East Africa. 2009

Type
Type: Tanzania, Kigoma District: Lubalisi village to Ntakatta, Bidgood, Leliyo & Vollesen 4621 (K!, holo. C, DSM, NHT, P, iso.)
Morphology General Habit
Perennial herb, becoming somewhat woody below
Morphology Stem
Stems single or multiple from a woody rootstock or creeping rhizome, erect, younger stems and immediately below inflorescence pubescent with eglandular hairs, older stems pubescent to ± glabrous
Morphology Leaves
Leaves opposite or ternate, sessile; blades lanceolate, 1.5–15 × 0.1–1.5 cm, ± entire, apex acute, base sessile, ± glabrous or pubescent with short stiff hairs, also with deeply set red sessile glands; venation often prominent on the lower surface, parallel in appearance
Morphology Reproductive morphology Inflorescences
Inflorescence in dense narrow heads, in fruit 40–140 × 18–25 mm, bracts subtending entire inflorescence linear, 4–15 mm long, acute, pubescent with short eglandular hairs, ciliate, deflexed, persistent through flowering stage; bracts subtending single flowers linear, ± 3 mm long, acute, pubescent and ciliate
Morphology Reproductive morphology Flowers Calyx
Calyx with tube ± 1 mm long at anthesis, outer surface with eglandular hairs and red sessile glands, inner surface with ± 0.5 mm long rounded-triangular scales present between calyx lobes; lobes 5, subulate, ± 2.5–3 mm long, with eglandular hairs often densely covering lobe margins; fruiting calyx with tube 4–6 mm long, ventrally gibbous, lobes ± erect, 4–5 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla white or blue, 8–9 mm long, pubescent to densely pubescent with eglandular hairs, the hairs and red sessile glands more plentiful towards lips ; tube very narrow and parallel-sided for 3–3.5 mm, then curving sharply downwards and broadening for 2–4 mm before opening out into two lips; posterior lip nearly as long as anterior, ± 3 mm long; anterior lip 3.5–4 mm long, ± 1.5 mm deep
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens connate for ± 1 mm, remaining enclosed with the lip
Morphology Reproductive morphology Fruits
Nutlets not seen
Figures
Fig 64, p 385
Ecology
Wet seepage grassland; ± 1100 m
Conservation
This species is at present known only from the three collections listed here. The current data suggest an area of occurrence of approximately 100 km2, and an area of occupancy of less than 10 km2, which would be consistent with P. lancifolia having a critically endangered status under criteria B1 and B2. However, criteria B1 and B2 also require observed, estimated or suspected decline, or fluctuations, in population size or habitat, and information from the collector of all three specimens (Vollesen, pers. comm.) suggests that the wet seepage grassland habitat is widespread in suitable places throughout west and south-west Tanzania, and is not generally under threat from agriculture because of the nutrient poor sandy soil, although there may be local risks due to grazing pressure. I therefore suggest that P. lancifolia should be given Vulnerable status, under criterion D2, since the population is known to occur in three locations only. This status should be regarded as provisional, since the range of P. lancifolia may be wider than indicated by the present material due to the widespread nature of its habitat.
Note
Pycnostachys lancifolia differs from P. graminifolia, to which it is probably most closely related, by differences in its calyx. The calyx tube is ventrally gibbous and pubescent with eglandular hairs, rather than funnel-shaped, very broad at the mouth and with short glandular hairs, and the calyx lobes are pubescent with eglandular hairs, rather than with short glandular hairs. In addition, the corolla of P. lancifolia is smaller (8–9 vs 11–12 mm), and shape is different, the narrow, parallel-sided section of the corolla of P. graminifolia being longer. This is a distinctive species showing variation in leaf size and indumentum among the three collections. The type is intermediate between Bidgood et al. 3926 which has bigger leaves, blue flowers and a long fruiting inflorescence and is generally a larger plant, and Bidgood et al. 3900, which has smaller, ternate leaves, and is conspicuously more pubescent. All three collections share inflorescence characters.
Distribution
Flora districts: T4 Range: Not known elsewhere

[KBu]

Bramley, G. (2005). Two New Species of Pycnostachys (Lamiaceae) from Tropical Africa. Kew Bulletin, 60(4), 587-592. Retrieved from http://www.jstor.org/stable/25070245

Conservation
This species is at present known only from the three collections listed here. The current data suggest an area of occurrence of approximately 100 km2, and an area of occupancy of less than 10 km2, which would be consistent with Pycnostachys lancifolia having a critically endangered status under criteria B1 and B2. However, criteria B1 and B2 also require observed, estimated or suspected decline, or fluctuations, in population size or habitat, and information from the collector of all three specimens (Vollesen, pers. comm.) suggests that the wet seepage grassland habitat is widespread in suitable places throughout west and south-west Tanzania, and is not generally under threat from agriculture because of the nutrient poor sandy soil, although there may be local risks due to grazing pressure. I therefore suggest that P. lancifolia should be given Vulnerable status, under criterion D2, since the population is known to occur in three locations only. This status should be regarded as provisional, since the range of P. lancifolia may be wider than indicated by the present material due to the widespread nature of its habitat.
Distribution
Africa. Tanzania, T4.
Ecology
Wet seepage grassland, either on flat valley bottoms or transition zone between Brachystegia woodland and the valley bottom; c. 1100 m.
Morphology General Habit
Perennial herb, 80-120 cm, single or multiple stemmed from a woody rootstock
Morphology Leaves
Leaves opposite or ternate, sessile; blades lanceolate, 15-150 x 1.5-15 mm, ± entire, apex acute, base sessile, ± glabrous or pubescent with short stiff hairs, also with deeply set red sessile glands; venation often prominent on the lower surface, parallel in appearance
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens connate for c. 1 mm until the posterior pair curves upwards sharply, the anterior pair longer, curving upwards more gradually but remaining enclosed with the lip; anthers c. 1 mm long
Morphology Reproductive morphology Flowers Calyx
Fruiting calyx with tube 4-6 mm long, ventrally gibbous, lobes more or less erect, 4-5 mm long, becoming thicker and more rigid, extending slightly, inner surface with 0.5-1 mm long rounded-triangular scales present between calyx lobes Flowering calyx with tube c. 1 mm long, outer surface with eglandular hairs and red sessile glands; lobes 5, subulate, c. 2.5-3 mm long, with eglandular hairs often densely covering lobe margins
Morphology Reproductive morphology Flowers Corolla
Corolla white or blue, 8-9 mm, pubescent to densely pubescent with eglandular hairs, the hairs and red sessile glands more plentiful towards lips; tube very narrow and parallel sided for 3 - 3.5 mm, then curving sharply downwards and broadening for 2-4 mm before opening out into two lips; posterior lip nearly as long as anterior c. 3 mm long, divided into four lobes, the two inside lobes c. 1 mm long, rounded, the two outer lobes c. 0.5 mm, narrower; anterior lip 3.5 - 4 mm long, c. 1.5 mm deep
Morphology Reproductive morphology Flowers Disc
Disk with anterior lobe slightly longer than ovary, c. 0.75 mm long, three posterior lobes shorter than ovary
Morphology Reproductive morphology Flowers Gynoecium Style
Style strongly upcurved, longer than stamens.
Morphology Reproductive morphology Inflorescences
Inflorescence in dense narrow heads, in fruit 40-140 x 18-25 mm, bracts subtending entire inflorescence linear, 4-15 mm long, apex acute, pubescent with short eglandular hairs, ciliate, deflexed, persistent through flowering stage; bracts subtending single flowers linear, c. 3 mm long, pubescent and ciliate with eglandular hairs
Morphology Stem
Stem erect, younger stems and immediately below inflorescence pubescent with eglandular hairs, older stems pubescent to ± glabrous
Note

This distinctive species is represented by only three collections showing variation in leaf size and indumentum. The type is intermediate between Bidgood et al. 3926 which has bigger leaves, blue flowers and a long fruiting inflorescence and is generally a larger plant, and Bidgood et al. 3900, which has smaller, ternate leaves, and is conspicuously more pubescent. The characters of the inflorescence, for example calyx size and shape, are the same in all three collections.

Pycnostachys lancifolia differs from P. graminifolia, to which it is probably most closely related, by differences in its calyx. The calyx tube is ventrally gibbous and pubescent with eglandular hairs, rather than funnel shaped, very broad at the mouth and with short glandular hairs, and the calyx lobes are pubescent with eglandular hairs, rather than with short glandular hairs. In addition, the corolla of P. lancifolia is smaller (8-9 rather than 11 - 12mm), and shape is different, the narrow, parallel sided section of the corolla of P. graminifolia being longer.

The two species share almost the same distribution: P. landfolia is apparently known only from Kigoma and Mpanda districts (FTEA area T4), and P. graminifolia is known only from Mpanda district and from Dodoma district (FTEA area T5). They also share the same habitat, that of wet seepage or swampy grassland.

Type
Tanzania, T4, Kigoma distr., Lubalisi village to Ntakatta, 5°57'S 30°09'E, 1100 m, 8 June 2000, Bidgood, Leliyo & Vollesen 4621 (holotypus K!; isotypi C, DSM, P, NHT).

Native to:

Tanzania

Coleus lancifolius (Bramley) A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Bidgood, S. [4621], Tanzania Pycnostachys lancifolia K000405985
Bidgood, S. [4621], Tanzania Pycnostachys lancifolia K000405984
Bidgood, S. [3900], Tanzania Pycnostachys lancifolia K000467425
Bidgood, S. [3900], Tanzania Pycnostachys lancifolia K000467426
Bidgood, S. [3926], Tanzania Pycnostachys lancifolia K000467424

First published in PhytoKeys 129: 64 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

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

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0