Home Flora of Missouri
Name Search
!Poa bulbosa L. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenSearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Published In: Species Plantarum 1: 70. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/28/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced


Export To PDF Export To Word

2. Poa bulbosa L. (bulbous bluegrass)

Pl. 181 a–c; Map 726

Plants perennial, without rhizomes but with swollen, somewhat bulblike stem bases, forming tufts. Flowering stems 8–35(–50) cm long, erect or ascending, circular in cross‑section or slightly flattened, glabrous. Leaf sheaths rounded, glabrous or minutely hairy, the ligule 1.5–3.5 mm long, rounded on the margin. Leaf blades 2–8 cm long, 1–3 mm wide, flat or folded, glabrous or minutely hairy. Inflorescences 3–8 cm long, relatively dense, the lowermost nodes with 2–5 branches, these ascending, roughened. “Normal” spikelets 3.5–4.5 mm long, with 3–6 florets, but most of the spikelets with the florets replaced by vegetative bulblets, these 5–25 mm long, with elongate, linear, pointed tips. Lower glume 1.5–2.2 mm long, narrowly lanceolate, sharply pointed at the tip, with narrow, thin margins, 1‑nerved, roughened along the midnerve. Upper glume 1.8–2.4 mm long, narrowly lanceolate, sharply pointed at the tip, with narrow, thin margins, 1‑nerved, roughened along the midnerve. Lemmas 1.8–2.6 mm long, elliptic‑lanceolate, sharply pointed at the tip, faintly 3‑nerved, short‑hairy along the midnerve and sometimes also the lateral nerves and with a tuft of long, cobwebby hairs at the base. Anthers 1.0–2.5 mm long. Fruits not produced in Missouri plants. 2n=14, 21, 28, 35, 36, 39, 40, 58. April–May.

Introduced, widely scattered in the state (native of Europe and Asia, introduced sporadically in the U.S. and adjacent Canada). Lawns, roadsides, sidewalks, and railroads.

In this unusual species, the ovaries of “normal” florets are shriveled at maturity and do not develop into fruits. Dispersal is by the vegetative bulblets, which can remain dormant for some time before growing into plants, and which presumably are spread by a variety of means, including road graders, mud on shoes and car tires, water, animals, and wind.



© 2018 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110