Fruits of species of Acer section Rubra. A A. rubrum. Specimen on left deposited at US National herbarium (US) with collection name and number: Lilian 62. Specimen on right deposited at Kew (K) as Acer drummondii Nutt. (= A. rubrum) with collection name and number: Drummond 53. Image of fruits obtained from image of specimen deposited in JSTOR Plants (http://plants.jstor.org/) B A. pycnanthum, used with attribution to Chinese Virtual Herbarium(http://www.cvh.ac.cn/); Miyoshi Furuse 54050, PE C A. saccharinum showing fruit with two fertilized ovules (upper) compared with one fertilized ovules and one partially developed, unfertilized ovule (lower). Specimens deposited at US with collection name and number: Wolf s.n. and Pringle s.n., respectively D A. laurinum Specimen deposited at K with collection name and number: Lindley, 418. Image of fruits obtained from image of specimen deposited in JSTOR Plants. Scale bar of 1cm applies to all images.