(199) Ligustrum - calyx and corolla four-parted; leaves simple fruit a berry.
* Stems furnished with leaves.
(200) Convolvulus - calyx five-parted, with two small, distant, basal bracts; corolla bell-shaped, five-plaited.
(201) Calystegia - calyx five-parted, enclosed in two foliaceous bracts; corolla bell-shaped, five-plaited.
** Stems thread-like, leafless.
(202) Cuscuta - calyx 4-5-cleft; corolla urceolate, or nearly globular.
(203) Polemonium - corolla rotate, with five stamens.
* Leaves opposite; (terrestrial herbs). † Stamens four.
(205) Gentiana - calyx not divided below the middle; style twolobed; flowers blue.
†† Stamens eight.
(206) Chlora - corolla rotate, yellow.
** Leaves alternate; (aquatic herbs).
(207) Villarsia - leaves entire, orbicular; flowers yellow.
* Fruit dry, capsular.
(208) Datura - corolla funnel-shaped, with a long tube; capsule prickly, four-valved.
(209) Hyoscyamus - corolla obliquely funnel-shaped; capsule smooth, opening transversely with a lid.
** Fruit fleshy, baccate.
(210) Solanum - corolla rotate; anthers porose, joined into a cone.
(211) Atropa - corolla bell-shaped; anthers distinct.
* Corolla tube open or naked at the orifice. † Stamens protruding; corolla irregular.
(212) Echium - corolla bell-shaped; the throat dilated; nuts wrinkled, attached by a flat triaugular base.
†† Stamens included; corolla regular.
(213) Lithospermum - corolla funnel-shaped; nuts smooth or tubercular, stony.
** Corolla tube closed with scales at the orifice. † Scales of the corolla subulate.
(214) Borago - corolla rotate; stamens exserted; filaments bifid, the inner fork bearing the anther; anthers connivent into a cone.
†† Scales of the corolla obtuse, concave. ‡ Corolla funnel-shaped.
(215) Lycopsis - tube of the corolla doubly curved; the limb oblique.
(216) Anchusa - tube of the corolla straight.
(217) Myosotis - corolla salver-shaped, with a straight tube; nuts ovate, compressed, smooth.
(218) Cynoglossum - corolla salver-shaped, with a straight tube; nuts roundish-ovate, depressed, muricated.
* Stamens two.
(219) Salvia - calyx tubular, two-lipped; corolla ringent; anthers one-celled with a lengthened connective.
(220) Lycopus - calyx five-cleft; corolla nearly equal; anthers two-celled.
** Stamens four. † Tipper stamens longer than the lower.
(221) Nepeta - calyx five-toothed; corolla ringent, the upper lip flat, straight, emarginate or bifid.
††Stamens nearly equal. ‡ Corolla nearly equal.
(222) Mentha - calyx equal, five-toothed; corolla four-lobed, the tube very short.
(223) Origanum - calyx with five equal teeth; corolla five-lobed obscurely two lipped; flowers in four-sided spikes, with imbricated bracts.
(224) Thymus - calyx two-lipped; corolla five-lobed, obscurely two-lipped; flowers whorled, axillary, or spiked.
††† Two tipper stamens shorter than the lower.
‡ Corolla distinctly two-lipped, the upper lip longer than the stamens.
§ Calyx regularly five-lobed.
Stamens shorter than the corolla lube.
(225) Marrubium - calyx tubular, the teeth nearly equal; upper lip of corolla straight, erect, cloven; nuts flatly truncate Stamens longer than the corolla tube.
(226) Galeopsis - calyx tubular, the teeth equal; upper lip of corolla arched; nuts rounded at the end.
(227) Stachys - calyx tubular-bellshaped, the teeth equal; upper lip of corolla concave; nuts obtuse and convex at the end.
(228) Leonurus - calyx tubular, the teeth nearly equal; upper lip of corolla nearly flat; nuts flatly truncate.
(229) Ballota - calyx funnel-shaped, the teeth equal; upper lip of the corolla erect, concave; nuts convex, and rounded at the end.
§§ Calyx obviously two-lipped.
(230) Scutellaria - calyx ultimately closed and compressed, both lips entire, upper with a concave scale on its back; corolla two-lipped, the upper lip concave.
(231) Prunella - calyx ultimately closed and compressed, the upper lip flat, truncate, three-toothed, the lower bifid; corolla ringent, the upper lip concave.
(232) Calamintha - calyx two-lipped, the lower bifid; upper lip of corolla straight, nearly flat.
‡‡ Corolla apparently one-lipped, the upper lip short or nearly wanting, shorter than the stamens.
(233) Teucrium - calyx tubular, five-toothed; upper lip of corolla bipartite, the tube slit along the back.