Lobelia (sect. Rhynchopetalum) Bentham 1876
Creators: name: Rollim, Isis De Mello
name: Coelho, Guilherme Peres
name: Miotto, Silvia Teresinha Sfoggia
name: Iganci, João Ricardo Vieira
name: Oliveira, Marcelo Trovó Lopes De
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Asterales
Campanulaceae
Lobelia

description: Key to the species of South American clade of Lobelia sect. Rhynchopetalum
1. Corolla shorter than 2.8 cm long, unilabiate, in shades of white or greenish ...................................................................................2.
– Corolla longer than 3 cm long, sub-bilabiate, frequently in shades of purple or pink ......................................................................3.
2. Stem and leaves glabrescent; bracts deflexed; seeds winged, wing in equal size to the seminiferous nucleus ................................... ................................................................................................................................................................................... Lobelia exaltata
– Stem and leaves densely tomentose; bracts erect; seeds not or slightly winged, wing when present narrower than the seminiferous nucleus....................................................................................................................................................................... Lobelia hassleri
3. Leaf blade ovate to suborbicular, margin crenulate to serrate; bracts ovate to suborbicular; seeds not winged.................................. ........................................................................................................................................................................... Lobelia santos-limae
– Leaf blade linear, lanceolate or oblong, margin entire, denticulate or dentate; bracts linear to lanceolate; seeds winged ...............4.
4. Leaves, bracts and fruits pubescents or puberulous ..........................................................................................................................5.
– Leaves, bracts and fruits glabrous .....................................................................................................................................................7.
5. Leaf blade tomentose on both surfaces; seeds slightly winged, wing narrower than the seminiferous nucleus.................................. .............................................................................................................................................................................. Lobelia thapsoidea
– Leaf blade tomentose only on the abaxial surface; seeds pronouncedly winged, wing equal size to the seminiferous nucleus ......... ...........................................................................................................................................................................................................6.
6. Stem glabrous; leaves with yellowish tomentum, leaf margin entire to denticulate, unhardened teeth; hypanthium campanulate .... .............................................................................................................................................................................. Lobelia brasiliensis
– Stem pubescent; leaves with whitish tomentum, leaf margin dentate, hardened teeth; hypanthium semi-globose............................. .............................................................................................................................................................................. Lobelia organensis
7. Leaf margin double serrate, teeth longer than 1 mm long; secondary veins arranged in 31–38 pairs ................ Lobelia glazioviana
– Leaf margin denticulate to dentate, teeth shorter than 0.5 mm long; secondary veins arranged in 9–27 pairs.................................8.
8. Bracts conspicuous, erect, frequently covering the pedicels; wing of seeds wider than the seminiferous nucleus ............................. .................................................................................................................................................................................. Lobelia fistulosa
– Bracts inconspicuous, deflexed, not covering the pedicels; wing of seeds narrower than the seminiferous nucleus.......................9.
9. Latex yellowish; inflorescence congest; bracteoles up to 1 mm long, margin entire............................................ Lobelia hilaireana
– Latex white; inflorescence lax; bracteoles conspicuous, up to 10 mm long, margin ciliate ................................... Lobelia langeana
description: Published as part of Rollim, Isis De Mello, Coelho, Guilherme Peres, Miotto, Silvia Teresinha Sfoggia, Iganci, João Ricardo Vieira & Oliveira, Marcelo Trovó Lopes De, 2022, Nomenclatural and taxonomic survey of the South American clade of Lobelia section Rhynchopetalum (Campanulaceae), pp. 45-54 in Phytotaxa 539 (1) on pages 48-49, DOI: 10.11646/phytotaxa.539.1.5, http://zenodo.org/record/6345927