Bartsia

Sylvester, Steven P., 2014, Bartsia lydiae, a new species of Bartsia sect. Laxae (Orobanchaceae) from the southern Peruvian Andes with a revised key to Bartsia sect. Laxae, Phytotaxa 164 (1), pp. 41-46 : 45-46

Key to the species of sect. Laxae (taken and revised from Molau, 1990)

1. All leaves with glandular hairs, the glands persistent ............................................................................................................ 2

- Mature foliage leaves with eglandular hairs only .................................................................................................................. 3

2. Much branched, ascending perennial (rarely annual); leaf margins evenly crenate with 4–6(–7) lobulae along each side; corolla reddish-purple; anthers sparsely villous ......................................................................................................... B. lydiae

- Solitary, erect annual; leaf margins deeply bullato-crenate with 10-14 lobelets along each side; corolla pale yellow; anthers glabrous ............................................................................................................................................................ B. adenophylla

3. Corolla pure yellow, the galea sometimes suffused with purple, the lip deflexed, usually gibbose, and 5–8 mm wide ......... ...................................................................................................................................................................................... B. flava

- Corolla basically red to purple, the lip erect, less than 5 mm wide; gibbae absent ............................................................... 4

4. Anthers completely glabrous.................................................................................................................................................. 5

- Anthers sparsely pilose to villous with white hairs................................................................................................................ 7

5. Leaves ovate, acute; calyx lobes erect ...................................................................................................................... B. remota

- Leaves elliptic or lanceolate, obtuse; calyx lobes with the tips ± reflexed ............................................................................ 6

6. Upper bracts distinct from foliage leaves, linear to elliptic, the margins entire, at least in the proximal half; Ecuador and N Peru............................................................................................................................................................................ B. mutica

- Bracts similar to foliage leaves, lanceolate to elliptic, the margins crenate throughout; Chile............................. B. chilensis

7. Leaves densely white-tormentose; calyx glandular villous; N Peru..................................................................... B.tomentosa

- Leaves pilose to hispid; Calyx pilose or hirsute, the hairs glandular or eglandular; Venezuela to N Bolivia....................... 8

8. Inflorescence dense, subspicate, the upper bracts prominent, lanceolate to subulate, acute or acuminate, entire or laciniatedentate, strigose with mostly eglandular hairs ................................................................................................... B. bartsioides

- Inflorescence loose, the bracts smaller than foliage leaves, crenate, dentate or entire, at least the upper ones glandularhirsute ..................................................................................................................................................................................... 9

9. Corolla with the galea orange-red and the lip bright yellow, the galea 1.4–1.7 × the length of the lip .............. B. camporum

- Corolla purple to deep red throughout, lip sometimes yellow-green, but then the galea 1.8–2.4 × the length of the lip.... 10

10. Calyx 10–15 mm long, the lobes straight, never reflexed; corolla lip yellow-green ....................................... B. weberbaueri

- Calyx 6–15 mm long, when more than 10 mm long the corolla lip usually red; calyx lobes reflexed............... B. inaequalis