“…The most important CG-containing plant families are Apocynaceae, incl. Asclepiadaceae (Adenium [1], Cerbera [2], Cryptostegia [3], Nerium [4,5], Parepigynum [6,7], Periploca [8][9][10], Strophanthus [11][12][13][14][15], Thevetia [16][17][18][19][20][21][22]), Brassicaceae (Erysimum [23][24][25][26][27][28][29], and Lepidium [30]), Celastraceae (Euonymus [31,32], and Lophopetalum [33]), Convallariaceae (Convallaria [34][35][36][37][38][39][40][41][42][43][44][45]), Crassulaceae (Cotyledon [46], and Tylecodon [47,48]), Hyacinthaceae (Schizobasis [49], and Urginea …”