A salt-loving plant on the roadside

This may be "old hat" to field botanists, but I was amazed to discover that a pretty halophile (salt-loving) plant species can flourish in a man-made microhabitat.

A week ago I found a small but cute plant with five-petalled pink-tipped flowers growing happily right next to the curb in an untended roadside verge. This was in the Bronx, very near the Bronx Zoo.

This spot is many miles from the ocean. However, it is on a curve that is dangerous in snow or ice conditions, which we get every winter here in NYC. Whenever there is snow and ice, the city sprays the blacktop with a salt and grit mixture, which improves the grip of tires on the road, and helps prevent skidding.

It also means that the very edge of the roadside on a curve gets liberally splattered with a wet salt and sand mixture, on and off for a few months each year.

Of course salt will kill most plants, but in the case of a rugged little species of Sand Spurrey, it appears that the road maintenance workers are accidentally creating a perfect little micro-beach.

Sand Spurreys are flowering plants in the same family as Pinks and Carnations -- they are tiny but pretty, and until humans started spraying roads with salt, these plants basically lived only by the sea, or in any other naturally-occurring salt-rich areas.

I would love to know how the seeds are spread in these man-made conditions -- do they get stuck in the grooves of tires and then fall out again? How does this plant spread from one roadside to another, miles apart?

由使用者 susanhewitt susanhewitt2016年06月26日 13:59 所貼文

觀察

照片/聲音

什麼

拟漆姑屬 ( Spergularia)

觀察者

susanhewitt

日期

6月 19, 2016

描述

This small plant was growing wild some distance outside the zoo property, right next to the curb of a small road which is near the parkway. It was a fairly lush roadside area, which is partly shaded by trees and seems not to be short of water. Further in from the curb there were some tall grasses and some Chicory.

This plant is somewhat similar to chickweed in scale, but it is far more erect, not entirely creeping, and the 5-petaled flowers clearly have pink at the ends of the petals.

I wrote a journal post about it here:

http://www.inaturalist.org/journal/invertzoo/6606-a-roadside-micro-beach

評論

I'm not surprised. Danish scurvygrass (Cochlearia danica) has been spreading inland along roads in Britain due to the increasing salinity of the soils: http://www.bbc.com/news/uk-wales-21123964

發佈由 duarte 約 8 年 前

Cool, thanks for the heads on that @duarte!

And how do the Danish Scurvygrass seeds spread?

發佈由 susanhewitt 約 8 年 前

That's really interesting! I live in TX now, but it never occurred to me that road salt might actually be beneficial for something other than road conditions. Thanks for sharing.

發佈由 beschwar 約 8 年 前

Me either -- I was really surprised, but as duarte pointed out, it is not the only example of this phenomenon. :)

發佈由 susanhewitt 約 8 年 前

Interesting, I know there are plants in Vermont that do this as well.

發佈由 charlie 約 8 年 前

Oh yeah? I would love to know which species they are, @charlie if you come across that info.

發佈由 susanhewitt 約 8 年 前

i don't remember offhand, will post here if it comes to mind!

發佈由 charlie 約 8 年 前

Thanks Charlie. :)

發佈由 susanhewitt 約 8 年 前

I now believe that what I found there was probably Spergularia marina.

發佈由 susanhewitt 大約 7 年 前

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