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Pilea pumila, known as Clearweed, Canadian clearweed, Coolwort, or Richweed is an annual plant native to most of North America east of the Rockies.

The plants are generally erect, 10 to 70 cm tall, often occurring in large colonies, and are quite common throughout their range both as a woodland plant and a weed of gardens.
The foliage is opposite, simple with dentate margins, wrinkly (with depressed veins), ovate, and with long petioles. Both the leaves and stems are translucent and bright green, turning bright yellow in autumn. The flowers are small, borne in axillary cymes, unisexual with both genders occurring on the same plant, greenish yellow, and pollinated by wind. Flowers bloom from midsummer through early autumn. Fruits (achenes) are green with purple markings. Roots are fibrous, shallow, and adventitious off the stem in moist areas or when in contact with the soil.
The plant is often mistaken for stinging nettle or Urtica dioica, but can be distinguished by the lack of trichomes, or stinging hairs, and the lower amount of branching of the inflorescences.
This plant is most often found in rich, moist soils in both sunny and shaded locations.
It is sometimes grown as a ground cover or for attracting deer. 
(from Wikipedia on 9.12.13) 

 

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ID of this anual herb. : Attachments (5). 20 posts by 11 authors.
What is the botanical name of this herb. The stem is translucent, the plant appears only during monsoon.
Date & Time        18/6/ 2010
Location: Place, Altitude, GPS        Chethalayam, Sultan Bathery, Wayanad, Kerala.
Habitat: Garden, Urban, Wild Type:        Wild
Plant Habit: Tree, Shrub, Climber, Herb        Annual herb
Height, Length.        10”
Leaves Type, Shape, Size        Oval, pointed, ¾”
Inflorescence Type Size        
Flowers Size Colour Calyx Bracts-        
Fruits Type, Shape, Size Seeds        
Other Information like Frangrance, Pollinator, Uses.        Stem translucent, plants seen only during monsoon.


I have seen this plant in Pattambi, Kerala. When I accidently touched this plant, I got stinging like sensation all over my hand. Looks like from the  nettle family. 


You have made an incorrect guess. The plant you are referring to is different. We have quite a bit of it. This plant as you will notice in one of the pictures is held by me in my hand. It does not create any allergy.
This plant is very tender, the stem contains a very large part of transparent fluid, in fact most of it is fluid.


… then it could be any other leaves before I touched this plant.


I feel it to be Girardinia diversifolia – (Link.) Friis. from Family Urticaceae


It is not Giradinia diversifolia. Please check the link below.
http://en.wikipedia.org/wiki/File:Girardinia_diversifolia_2.jpg


Agee with … This is Laportea interrupta [Fleurya interrupta] a type of stinging nettle.


In Bengali we call Laportea interrupta as “Lal Bichuti” [Red Stinging nettle] . A member of  Urticaceae  hence causes itching which we touch the tip of the stem with young leaves which has some stinging hair causing the irritation but older parts are safe. Probably … touched the tip of this plant and as from the photo of … I see the is holding the base of the stem so never realized the sting but the stinging hairs are visible in the photos.


Adding the link from Flora of China with description and illustration
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242328231


The plant you are referring to is different. I will send you the pictures of it within 1/2 an hour. This is different. It is not Laprtea interrupta. In fact I am just attaching a copy of the picture of Laportea interrupta for your perusal. I must admit however, that both the plants appear very similar to each other. The difference is in the stem. The stem of the plant that I have sent is almost transparent and the stem of Laportea interrupta is redish and has fine hair like particles on it. It is taking too long to upload as such am sending them to you by picasa.


… would it be some species of Acalypha ?


Looks like Acalypha species..


The venation pattern (3-main nerves with impressed reticulations), hairs (some members of nettle family i.e. Urticaceae are really harmless) and the inflorescence (no bracts as the case in Acalypha) and stems (delicate/fleshy) all making me to think of Pilea, most probably Pilea pumila of Urticaceae. This species is not having stinging hairs unlike its other relatives. 
However, I look forward for validation of its id!


a great choice rally do the plant looks like Pilea pumila !! Thanks for pointing out the features overlooked by me.


I think you have got it spot on. Here is a link with pictures
http://www.google.co.in/search?q=Pilea+pumila&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGGL_en___IN364


If anyone familiar with Rajmachi, goes near the catchment of Tungi dam, he/she would surely come across this stinging plant specially during/post monsoon season


The plant is not what you state. Its identity has been confirmed as Pilea Pumila, identified by …, confirmed by … I have also copied a link in my last mail which clearly shows the pictures of Pilea pumila. These pictures matches the ones posted my me.


I think it is Urtica Parviflora


No, it is not Urtica Parviflora. It is Pilea Pumila only.


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ANAUG52 Please identify this herb : 5 posts by 3 authors. Attachments (2).

Growing as a weed
Bangalore
August 2014


Could it be Pilea nummularifolia??


Thank you very much sir.

I followed your lead and found that this unidentified herb (attached) photographed by me was Pilea nummularifolia whilst a simple search of http://davesgarden.com/guides/pf/go/140735/ proved that the original plant posted is, most likely, Pilea pumila. Both are ornamentals and exotics.

Please let me know what you think sir, 


 

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Pilea pumila (L.) A. Gray ?? : 5 posts by 2 authors. Attachments (4)

Location:  Kalimpong, WB, India
Date: 10 May 2018
Altitude: 4300 ft.
Habit : Wild 


Appears close as per details and images at Pilea pumila ? But is it really found in India ?
To me our images look different (particularly the leaf hairiness) from those at  
May be our posts are from some other species. 

Thank you …! I have no  idea about it but it was shot at the same location. 

 

 

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