Mazus pumilus looks similar to M. surculosus, but the orange stripes on the lower lip are longer in latter.
In addition the species can be differentiated as under:
M. pumilus: Annuals, up to 30 cm tall, stems glabrous or with short hairs; basal leaves usually shed at flowering time; flowers mostly in upper part of inflorescence; calyx lobes ovate, as long as tube, acute; middle lobe of lower lip smaller than lateral lobes; lobes of upper lip triangular-ovate; capsule globose
M. surculosus: Perennials, up to 8 cm tall, stem with long white hairs; basal leaves forming a rosette present at flowering time; flowers almost from base of raceme, lax; calyx lobes 1/3 as long as calyx, broadly ovate with obtuse to subacute tip; middle lobe of lower lip longer than lateral lobes; lobes of upper lip suborbicular; capsule ovoid
Mazus page (Phrymaceae) with images of species in efloraofindia : 1 post by 1 author.
Pl. go through Mazus page (Phrymaceae) with images of species in efloraofindia (done by me).
If you find any mis-identification, pl. let us know.
If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.