1784 tr. C. Linnaeus (1785) II. 645 Shrubby erect, leaves egg-hearted, opposite sessile, prickles superaxillary, calyxes intire.
1863 2 164 Flowers white with a yellowish throat, few, rather remote, on long, lateral, superaxillary pedicels.
1996 70 1076/2 It has rather distantly spaced leaves and superaxillary cones.