Posts Tagged ‘Matelea obliqua’

A Climbing Milkweed

Yes, I got excited over finding this vine.

I knew what it was. It grows on my rural property. It’s a climbing milkweed (Matelea obliqua) and is an Illinois state-threatened plant. The vine prefers to grow in rocky woodlands.

It’s odd that only one vine grew here where I found this one in the woods, up from a small lake. It’s odd too that it was still greenish the middle of November, since they bloom the end of May.

I took this picture on my property on May 23, 2007.

I could have it miss-identified because there were no flowers. There’s another species Matelea dicipiens that grows in 2 of the surrounding counties and isn’t listed in Saline County. It’s state-endangered. The difference between the two is the width of the petals. The one above has 1.5 – 2.5 mm width; the other’s petal width is 3-6 mm. Both bloom at May to June. The one on my property was found and identified by a heritage biologist.

While researching this in my resource books and online, I found out there’s a third species, Matelea gonocarpa, that’s found the southern 1/6th of the state and is endangered. It grows in floodplains, which this location isn’t.

Of course, I may have the vine misidentified all together, and it’s not a milkweed vine. If not, I have no idea what it could be. At least I visited my climbing milkweed vicariously on the hike.