(B. ) H. & Hjert., ?Phyton 9: 144. 1960.?, 1960.

(B. ) H. & Hjert., ?Record Scott. Pl. Breed. Sta.2, 1963: 105. 1963.?, 1963.

(B. ) H. & Hjert. and Hawkes, (B. ), ?Rep. (Annual) Scott. Pl. Breed. Sta. 1956: 61. 1956.?, 1956.