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Published In: A Manual of Botany of the Northern United States (ed. 5) 542. 1867. (Manual (ed. 5)) Name publication detailView in Biodiversity Heritage Library
 

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

 

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5. Juncus brachycarpus Engelm.

Pl. 94 d, e; Map 362

Aerial stems 30–80 cm tall, closely spaced along tuberous rhizomes. Leaves with the auricles at the top of the sheaths 0.5–3.0 mm long, papery, rounded, the leaf blades 3–50 cm long, 1–2 mm wide, tubular and hollow, circular in cross-section, with cross-partitions at regular intervals. Basal leaves few, 1 of the sheaths sometimes lacking a leaf blade. Leaves of the aerial stems 2–4. Inflorescences racemes or few-branched panicles, the branches mostly ascending, the leaflike bract at the base shorter than the inflorescence. Flower clusters mostly 2–10(–20) per inflorescence, mostly spherical, each with 30–100 flowers. Flowers lacking a pair of closely subtending bracts. Perianth 2.2–3.8 mm long, the sepals longer than the petals, linear-lanceolate, the tips attenuate. Stamens 3 per flower. Fruits 1.5–2.7 mm long, 1/2–3/4 as long as the perianth, narrowly ovate to obconical in outline, the tip abruptly pointed with a small mucro, 1-locular. Seeds 0.3–0.4 mm long, both ends acute with asymmetrically darkened points. 2n=44. May–September.

Scattered in the state, mostly south of the Missouri River (eastern U.S. and adjacent Canada west to Texas). Moist bottomland prairies and along margins of streams.

The strongly unequal perianth whorls that nearly conceal the relatively short capsules serve to distinguish this species from morphologically similar taxa, such as J. nodosus, J. scirpoides, and J. torreyi.

 
 


 

 
 
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