This non-native grass is a spring or fall annual that completes its life cycle within a short period of time (about 6 weeks). It is usually quite small, consisting of a low tuft of vegetation about 4" across and 1½" tall. However, substantially larger plants are sometimes observed. The typical plant has sprawling culms about 2½" long that are unbranched, except at the base. They are light green, glabrous, terete, and largely covered by the sheaths. The blades of the alternate leaves are 1½" long and 1/8" (2.5 mm.) across; they are dull to bright green, hairless, and keel-shaped at their tips. The leaf sheaths are light to medium green, hairless, open, and longitudinally veined. At the junction of each sheath and blade, the ligule consists of a papery membrane. Each culm terminates in a flattened panicle of spikelets about ¾" long and ½" across. In atypical plants, the culms, leaf blades, and panicles are larger in size than what is indicated above. The somewhat flattened spikelets are light or whitish green. Each spikelet is about 4.5 mm. long and 2 mm. across; it consists of 2 glumes and 3-6 lemmas that are arranged in two columnar ranks. The curved glumes are oblong-lanceolate in shape and membranous along their margins; the larger glume is about 2.0 mm. long, while the smaller glume is about 1.5 mm. long. The curved lemmas are elliptic-ovate in shape, membranous along their margins, and faintly veined; sometimes there is a reddish purple patch near the apex of each lemma. The lemmas are often pubescent along their veins. Unlike many other Poa spp. (Bluegrasses), there is no web of hairs at the base of each lemma. The blooming period occurs during the spring or fall. During the hot weather of summer (or sub-freezing weather of winter), this grass dies down and becomes tan, dispersing its seeds. The root system is shallow and fibrous. This grass reproduces primarily by reseeding itself; less often, it may form rootlets at the nodes of the leaves. Small colonies of plants are formed occasionally.