Poa bulbosa

Common names: Bulbous bluegrass
Treatment appears in FNA Volume 24. Treatment on page 516.

Plants perennial; densely tufted, not rhizomatous, not stoloniferous. Basal branching intravaginal. Culms 15-60 cm, erect or spreading, bases bulbous. Sheaths closed for about 1/4 their length, terete, lowest sheaths with swollen bases; ligules 1-3 mm, smooth or scabrous, apices obtuse to acute; blades 1-2.5 mm wide, flat, thin, lax, soon withering. Panicles 3-12 cm, ovoid; nodes with 2-5 branches; branches ascending to spreading, terete, usually smooth or sparsely scabrous, infrequently moderately scabrous. Spikelets 3-5 mm, laterally compressed, usually bulbiferous; florets 3-7, the basal floret, and sometimes additional florets, normal; rachilla internodes smooth, glabrous. Glumes keeled, keels scabrous; lower glumes 3-veined; upper glumes shorter than or subequal to the lowest lemmas; calluses webbed or glabrous; lemmas 3-4 mm, lanceolate, keeled, glabrous or the keels and marginal veins short- to long-villous, intercostal regions glabrous or softly puberulent, apices acute; paleas scabrous, keels often softly puberulent at midlength; anthers 1.2-1.5 mm and functional, sometimes aborted late in development, sometimes not developed. 2n = 14, 21, 28, 39, 42, 45.


Wash., Del., Wis., W.Va., N.J., N.Y., Wyo., N.Mex., Tex., La., N.C., Tenn., Pa., Nev., Va., Colo., Calif., Ark., Vt., Ill., Ga., Ind., Iowa, N.Dak., Nebr., Okla., S.Dak., Ariz., Idaho, Conn., Md., Mass., Ohio, Utah, Mo., Minn., Mich., Kans., Mont., Oreg., Ky.


Poa bulbosa is a European species that is now established in the Flora region. In southern Europe and the Middle East, it is considered an important early spring forage.

Selected References



1 Spikelets not bulbiferous Poa bulbosa subsp. bulbosa
1 All or some spikelets bulbiferous Poa bulbosa subsp. vivipara
... more about "Poa bulbosa"
Robert J. Soreng +
Bulbous bluegrass +
Wash. +, Del. +, Wis. +, W.Va. +, N.J. +, N.Y. +, Wyo. +, N.Mex. +, Tex. +, La. +, N.C. +, Tenn. +, Pa. +, Nev. +, Va. +, Colo. +, Calif. +, Ark. +, Vt. +, Ill. +, Ga. +, Ind. +, Iowa +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Ariz. +, Idaho +, Conn. +, Md. +, Mass. +, Ohio +, Utah +, Mo. +, Minn. +, Mich. +, Kans. +, Mont. +, Oreg. +  and Ky. +
Introduced +
Poa sect. Bolbophorum +
Poa bulbosa +
Poa sect. Arenariae +
species +