Stylidium tenellum Sw.

 
  • Family : STYLIDIACEAE
    (STYLIDIUM or TRIGGERPLANT FAMILY)
  • Family (as per The Plant List) : Stylidiaceae
  • Species Name (as per The Plant List) : Stylidium tenellum Sw.
  • Common name : Trigger Plant
  • Habit : Herb
  • Habitat : Damp ground
  • Comments / notes : This species reported by Bhaskar and Kushalappa is a new occurrence record for South India and was collected by them from Devarayanagurga (Tumkur District). The herb is spread in moist grassy places at the foothills during monsoon. The plants are inconspicuous in stature that one may mistake it for some common Utricularias. The column (or trigger) is a sensitive part moving elastically on touch to rest between labellum and posterior lobes before resetting.
  • Key identification features : Very small slender herbs, glabrous, branched, branches filiform with copper-brown stem; leaves alternate, basal leaves mostly spathulate or linear or ovate, 3-nerved visible only on upper surface; flowers solitary, minute, sessile in the axils of leafy bracts, base glandular, sepals 5, persistant in fruits, corolla rose or pink colored, strongly bilabiate, two of them with prominent ray-like lobes. Stamens 2 with filaments united and connate. Fruit is a linear capsule.
  • Flower, Fruit : September-January
  • Distribution :
    • Karnataka : Tumakuru district
    • Odisha : Sambalpur district, Ganjam district, Keonjhar district, Jharsuguda district
  • World Distribution : India, Indo-China, Malaysia
  • Conservation Status : Not Evaluated (NE)
  • Literature : Bhaskar & Kushalappa, 2013- Flora of Tumkur District; Pullaiah et al., 2011 - Flora of Eastern Ghats Vol. 4; H.O. Saxena & M. Brahmam, 1995- Flora of Orissa Vol. 2
  • Citation : Sankara Rao, K., Raja K Swamy, Deepak Kumar, Arun Singh R. and K. Gopalakrishna Bhat (2019). Flora of Peninsular India. http://peninsula.ces.iisc.ac.in/plants.php?name=Stylidium tenellum. Downloaded on 22 September 2019.

Botanical Description

Herbarium Specimen(s)

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Based on a work at http://peninsula.ces.iisc.ernet.in.