To Asa Gray 20 March 
Down Beckenham | Kent
Will you be so kind as to tell me whether Mr. Thompson of Ipswich is right that Ipomœa leptophylla makes a great tuber as big as a manget-wurzel.— A word on post-card wd suffice. Petioles of Cotyledons behave partly like those of Megarrhiza.
Asks AG to confirm whether Ipomoea leptophylla "makes a great tuber as big as a mangel-wurzel".
Petioles of Cotyledons behave partly like those of Megarrhiza.
Please cite as
Darwin Correspondence Project, “Letter no. 12541,” accessed on 24 March 2017, http://www.darwinproject.ac.uk/DCP-LETT-12541