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Published In: Species Plantarum 2: 1197. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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

 

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3. Rubus parvifolius L. (Japanese raspberry)

Map 2501

Canes to 300 cm long, low-arching to prostrate, to 70 cm tall, often rooting at the tips and occasionally at other nodes. Primocanes green to purplish green in summer, turning reddish brown in winter, 2.0–3.5 mm in diameter. Prickles moderate to dense, 0.5–4.0 prickles per cm of cane, slender and downward-angled or downward-curved, 1–2 mm long. Petioles armed with slender, downward-curved prickles 1–2 mm long. Stipules 8–18 mm long, linear-lanceolate and sometimes cleft into 2 lobes. Primocane leaves with 3 leaflets or pinnately compound with 5 leaflets, margins coarsely and broadly toothed, the upper surface glabrous, the undersurface white-felted. Central primocane leaflets of leaves with only 3 leaflets 3.5–8.5 cm long, 3.0–7.5 cm wide, obovate to broadly subrhombic, often lobed, angled at the base, angled or tapered to a bluntly pointed tip, the leaflet stalk about 2/5–1/2 as long as the leaflet blade when only 3 leaflets are present; lateral leaflets rhombic (or elliptic when 5 leaflets are present), nearly sessile. Inflorescences simple to complex clusters, in extreme cases paniculate, 15–45 cm long, with (3–)10–19 flowers and 4–10 leafy bracts, these mostly with 3 leaflets; flower and inflorescence stalks with stiff hairs, and small needlelike and broad-based prickles, the flower stalks branched on vigorous inflorescences. Sepals 6–10 mm long and 3–4 mm wide at flowering, expanding to 8–12 mm long and 4–5 mm wide at fruiting, triangular-ovate. Outer surface of sepals prickly. Petals 4–6 mm long, spatulate, rose pink. Fruits 10–15 mm long, 10–17 mm wide, hemispheric to short-conic when well formed (some populations produce few drupelets, if any), bright, glossy red when ripe. 2n=14, 21, 28. May.

Introduced, known thus far only from Greene County (native to Asia, Australia; naturalized in Illinois, Iowa, Massachusetts, Missouri, Virginia). Edges of mesic upland forests; also roadsides and open, disturbed areas.

This unusual member of subgen. Idaeobatus was first collected by Michael Currier in 1989, but was not correctly determined for another nine years. The species is first reported from Missouri in the present account. The population, which is near the Dickerson Park Zoo in Springfield, has continued to expand locally. In Iowa, populations of this species also have been noted as expanding, and may invade prairies and savannas (Drobney and Widrlechner, 2010).

 
 


 

 
 
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