Bartsia (sect. Laxae)
Creators: name: Sylvester, Steven P.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Orobanchaceae
Bartsia

description: 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
description: Published as part of 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, pp. 41-46 in Phytotaxa 164 (1) on pages 45-46, DOI: 10.11646/phytotaxa.164.1.4, http://zenodo.org/record/5132543