Introduce Plants
 

Plectranthus monostachyus

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SSN 54652
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Taxonomy

The taxanomic status is pending for approval

Description

Plectranthus monostachyus is a perennial herb with stems measuring up to 50 cm tall. The flowers are small with a two-lipped calyx. The lower lip can be 3-4 mm long and has deep purple colour.

This species is native to tropical West Africa. P. monostachyus is a new record not only for Peninsular Malaysia and Singapore, but also for the Malesian region. This species was first collected in Peninsular Malaysia in 2003 and has since become widespread and is often extremely common where found. It has not yet been recorded in Sabah and Sarawak. This plant can grow in waste ground and cultivated areas with lightly shaded to full sun exposure. P. monostachyus begins to flower at 10 cm tall and has sticky seeds which allows seed dispersal by animal or by water. Whatever the methods, its seed dispersal is very effective as seen by its rapid spread and abundance. Because of its copious seed production and small tubers, it may prove difficult to eradicate.

This species is probably introduced within the last 10 years due to the horticultural trade. Its introduction is very worrying because it has become widespread in a very short time. It should certainly be on a watch-list by the plantation industry as it threatens to become an aggressive noxious weed. In Singapore, Chung et al. (2015) assessed it as a high risk weed.

Among the Plectranthus species grown in Malaysia, P. monostachyus resembles P. amboinicus the most in terms of its leaf shape and size, terminal spikes, small flowers with a 2-lipped calyx and abruptly curved corolla. However, it is distinctly different in its thin leaves with a faint, rather foetid smell and cymules with 3 -5 flowers compared with P. amboinicus that has thick, succulent and strongly aromatic leaves and many-flowered cymules with 10-20 flowers.

Habits

  Part Habit
 
Erect   —   Having an essentially upright vertical habit or position.

Location

by State Location
  • Kelantan 1
  • Selangor 3
  • Federal Territories of Kuala Lumpur 1
by Protected Areas Location
  • Wildlife Sanctuary/Reserve 1
Based on publications, specimens, and images

Biodiversity Experts

Profile
Ahmad Aldrie Amir (Dr.)
Universiti Kebangsaan Malaysia (UKM)
  • Vascular
  • Biodiversity
  • Climate Change
  • Conservation
  • Ecosystems
  • Environment
  • Evolution
  • Forest
  • History
  • Law and Policy
  • Management
  • Marine & Coastal
  • Protected Areas
  • Science
  • PM
  • SBH
  • SWK
  • SEA
  • W
Anisah Lee Abdullah (Assoc. Prof. Dr.)
Universiti Sains Malaysia (USM)
  • Coral Reefs
  • Vascular
  • Biodiversity
  • Climate Change
  • Conservation
  • Ecosystems
  • Environment
  • Geoinformatics
  • Management
  • Marine & Coastal
  • Protected Areas
  • Science
  • Technology
  • Water
  • PM
  • SBH
Asyraf Mansor (Dr.)
Universiti Sains Malaysia (USM)
  • Palms
  • Vascular (Ecology)
  • Biodiversity
  • Conservation
  • Ecosystems
  • Environment
  • Evolution
  • Forest
  • PM
Chan Yoke Mui (Ms.)
Forest Research Institute Malaysia (FRIM)
  • Palms (Ecology)
  • Vascular (Ecology)
  • Conservation
  • Biodiversity
  • Forest
  • Genetics
  • PM
Chong Ju Lian (Dr.)
Universiti Malaysia Terengganu (UMT)
  • Mammals (Ecology)
  • Vascular (Ecology)
  • Invasive Alien Species
  • Protected Areas
  • Digital Sequence Information (DSI)
  • Marine & Coastal
  • Climate Change
  • PM
  • SBH
  • SWK
  • SEA
  • W
Kartini Binti Saibeh (Dr.)
Universiti Malaysia Sabah (UMS)
  • Vascular
  • Agriculture
  • Biodiversity
  • Conservation
  • SBH
Mohamad Azani Alias (Assoc. Prof. Dr.)
Universiti Putra Malaysia (UPM)
  • Vascular (Taxonomy)
  • Biodiversity
  • Conservation
  • Climate Change
  • Protected Areas
  • PM
  • SBH
  • SWK
  • SEA
Nazahatul Anis Amaludin (Dr.)
Universiti Malaysia Kelantan (UMK)
  • Vascular (Ecology)
  • Biodiversity
  • Conservation
  • PM
Nor Ezzawanis Abdullah Thani (Mrs.)
Forest Research Institute Malaysia (FRIM)
  • Vascular (Taxonomy)
  • Digital Sequence Information (DSI)
  • PM
Nur Kyariatul Syafinie Abdul Majid (Ms.)
Universiti Malaysia Kelantan (UMK)
  • Vascular (Ecology)
  • Biodiversity
  • Climate Change
  • Conservation
  • Forest
  • Protected Areas
  • PM
Nur Supardi Md Noor (Dr.)
Forest Research Institute Malaysia (FRIM)
  • Palms
  • Vascular
  • Biodiversity
  • Climate Change
  • Conservation
  • Ecosystems
  • Environment
  • Forest
  • Management
  • PM
  • SBH
  • SWK
  • SEA
  • W
Rusea Go (Prof. Dr.)
Universiti Putra Malaysia (UPM)
  • Orchids (Taxonomy)
  • Vascular (Taxonomy)
  • Vascular (Ecology)
  • Biodiversity
  • Conservation
  • Environment
  • Forest
  • Management
  • Protected Areas
  • Climate Change
  • Invasive Alien Species
  • PM
  • SBH
  • SWK
Tam Sheh May (Dr.)
Taylor's University
  • Orchids
  • Vascular
  • Biodiversity
  • Data Analysis
  • Evolution
  • Genetics
  • Molecular
  • PM
Tan Swee Lian (Dr.)
Academy of Sciences Malaysia (ASM)
  • Vascular (Ecology)
  • Agriculture
  • Biodiversity
  • PM
  • SBH
  • SWK
PM - Peninsular Malaysia; SBH - Sabah; SWK - Sarawak; SEA - Southeast Asia; W - World;

Acknowledgements :- Ms. Aida Salihah Binti Abu Bakar, Ms. Nurfarhana Hizan Binti Hijas, Mr. Tan Kok Kiat & Mr. Yasser Mohamed Arifin

Citation :- Plectranthus monostachyus. Malaysia Biodiversity Information System (MyBIS). https://www.mybis.gov.my/sp/54652. Downloaded on 29 October 2020.

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