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Published In: Florula Bostoniensis..., ed. 2 199–200. 1824. (Fl. Boston. (ed. 2)) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 9/22/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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10. Rubus frondosus Bigelow (Yankee blackberry)

R. pratensis L.H. Bailey

Pl. 541 f–h; Map 2508

Canes to 200 cm long and 70–130 cm tall, 3–7 mm in diameter. Prickles moderate, 0.5–1.2(–2.0) per cm of cane, 2.5–5.0 mm long. Petioles with sparse to dense nonglandular hairs, armed with fine, needlelike, downward-angled prickles to 3 mm long. Stipules 10–18 mm long, linear to linear-lanceolate. Primocane leaflet margins sharply toothed, the upper surface thinly hairy, the undersurface velvety hairy. Central primocane leaflets (7–)8–14 cm long, (5–)6–11 cm wide, nearly orbicular to ovate-elliptic, cordate to subcordate at the base, tapered to a sharply pointed tip, the leaflet stalk about 1/6–3/10 as long as the leaflet blade; middle leaflets rhombic to elliptic or elliptic-obovate, angled to rounded at the base, tapered to a sharply pointed tip, stalked; basal leaflets elliptic, angled at the base, tapered or short-tapered to a sharply pointed tip, sessile. Inflorescences racemose, sometimes flaring toward the apex, but typically compact, 3.0–17.5 cm long, 5–11 cm wide, with 1–11 flowers and 3–9 bracts, these leafy, about evenly divided between simple bracts and those with 3 leaflets; flower and inflorescence stalks with nonglandular hairs and rarely with needlelike prickles. Sepals 6–10 mm long, 3–4 mm wide, triangular-elliptic, tapered to a sharply pointed tip or abruptly tapered to a short, slender point. Petals 8–14 mm long, obovate. Fruits 10–15 mm long, 10–16 mm wide, globose. May–June.

Scattered nearly throughout the state (northeastern U.S. and adjacent Canada west to Kansas, Iowa, and Minnesota). Bottomland forests, mesic to dry upland forests, banks of streams, bases, ledges, and tops of bluffs, and upland prairies; also pastures, old fields, old quarries, cemeteries, railroads, and roadsides.

Rubus pratensis, a synonym of R. frondosus (Widrlechner, 1998), was described based on a Missouri type (L. H. Bailey, 1945) collected by B. F. Bush from a prairie in Cooper County. A white-fruited form from Howell County was described as R. pensilvanicus Poir. f. albinus E.J. Palmer & Steyerm..

 


 

 
 
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