Stemodia diplohyptoides, Sosa & Dematteis, 2014

Sosa, María De Las Mercedes & Dematteis, Massimiliano, 2014, Stemodia diplohyptoides (Plantaginaceae, Gratiolae): a new diploid species from South America, Phytotaxa 186 (5), pp. 271-278 : 276

Key to S. diplohyptoides and related species from southern South America

1. Corolla 12-16 mm long. Floral bracts mostly up to 2 times as long as the subtended flowers. Leaf blades lanceolate ..................... ………………. ……………….……………………… .........................................................................................……. S. lanceolata

- Corolla 5-10 mm long. Floral bracts shorter than the subtended flowers. Leaf blades obovate to oblanceolate. .............................2

2. Herbs annual, 10-50 cm; leaves broad obovate, base clasping and somewhat flanged, leaf margin less serrate (≤ 20 teeth on each of side)……………………… ............................................................................................................................ ….……….. S. stricta

- Herbs perennial 50-200 cm; leaves narrow obovate to oblanceolate, base slightly auriculate; leaf margin more serrate (≥ 20 teeth on each of side)…………............................................................................................................................……………………….. 3

3. Leaves 23–65 x 8–35 mm, narrowly obovate, barely pubescent. Corolla 8–10 mm long, ovules 98–133 µm long ........................... …………………………………………..… ...................................................................................... …………..… S. diplohyptoides

- Leaves 40–90 x 10–45 mm, oblanceolate, notably hirsute pubescent. Corolla 7.5 mm long, ovules 107–151 µm long .................... ……………………………….……………… ............................................................................................... …………. S. hyptoides