Pseudorontium

Rothmaler

Feddes Repert. Spec. Nov. Regni Veg. 52: 33. 1943.

Etymology: Greek pseudo, false, and genus Orontium, alluding to resemblance of seeds
Basionym: Antirrhinum sect. Pseudorontium A. Gray Proc. Amer. Acad. Arts 12: 81. 1876
Treatment appears in FNA Volume 17. Treatment on page 42. Mentioned on page 13, 16, 37, 44.
 TaxonIllustrator 
FNA17 P07 Pseudorontium cyathiferum.jpegPseudorontium cyathiferum
Sairocarpus kingii
Callitriche hermaphroditica
Barbara Alongi
Barbara Alongi
Yevonn Wilson-Ramsey

Herbs, annual. Stems erect, branching, filiform, twining branches absent, glandular-hairy, viscid. Leaves cauline, opposite proximally, alternate distally; petiole present; blade not fleshy, not leathery, margins entire. Inflorescences axillary, flowers solitary; bracts present, alternate. Pedicels present, not twining, recurved in fruit; bracteoles absent. Flowers bisexual; sepals 5, basally connate, calyx slightly bilaterally symmetric, cupulate, lobes linear to narrowly oblanceolate; corolla purple with darker veins, bilaterally symmetric, bilabiate and personate, tubular, tube base gibbous abaxially, not spurred, lobes 5, abaxial 2, adaxial 3; stamens 4, basally adnate to corolla, didynamous, filaments glabrous or sparsely hairy, pollen-sacs 1 per filament; staminode 0 or 1, capitate; ovary 2-locular, placentation axile; stigma subcapitate. Fruits capsules, locules equal, dehiscence poricidal. Seeds 30–70, black or dark-brown, ellipsoid, wings present, cupulate. x = 13.

Distribution

sw United States, nw Mexico

Discussion

Species 1.

Pseudorontium is similar to Mohavea in having winged seeds, but R. K. Oyama and D. A. Baum (2004) and P. Vargas et al. (2004) found Pseudorontium positioned well outside the taxa usually included in Antirrhinum in both the narrow (D. A. Sutton 1988) and broad (D. M. Thompson 1988) senses. ITS results in M. Fernández-Mazuecos et al. (2013) placed Pseudorontium and Mohavea in different clades; Pseudorontium was sister to Galvezia. The pendent, globular capsules, eccentrically winged seeds, and lack of twining branches distinguish P. cyathiferum from species of Sairocarpus.

Selected References

None.

... more about "Pseudorontium"
Kerry A. Barringer +  and Neil A. Harriman† +
Rothmaler +
alternate +, opposite +, whorled +, helical +  and subopposite +
Antirrhinum sect. Pseudorontium +
not leathery +  and not fleshy +
glandular-hairy +
cupulate +
personate +  and bilabiate +
sw United States +  and nw Mexico +
drupe-like +
curved +  and straight +
Greek pseudo, false, and genus Orontium, alluding to resemblance of seeds +
hairy +  and glabrous +
1 +  and 4 +
poricidal +, septicidal +, loculicidal +  and dehiscence +
alternate +  and opposite +
persistent +  and deciduous +
linear;narrowly oblanceolate +
entire +  and subentire toothed or lobed +
axile +  and parietal +
basal +, apical +  and superior +
tenuinucellate +, unitegmic +  and hemitropous +
campylotropous +, hemianatropous +  and anatropous +
5 +  and 4 +
Feddes Repert. Spec. Nov. Regni Veg. +
minute +
dark-brown +  and black +
ellipsoid +
climbing +  and scrambling +
sprawling +, creeping +  and prostrate +
filiform +
Pseudorontium +
Plantaginaceae +
cupulate +