Bactris longiseta H.Wendl. ex Burret, Repert. Spec. Nov. Regni Veg. 34: 213 (1934)

Primary tabs

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Costa Ricapresent (World Checklist of Arecaceae)B
Costa Rica (Alajuela, Heredia, Limón).
Lowland rain forest, at 100-750 m elevation. (Henderson, A.J., Bactris (Palmae) in Flora Neotropica Monographs 79. 2000)A

Discussion

  • Bactris longiseta is diagnosed by its linear to elliptic, caudate pinnae, obovoid, purple fruits, and numerous endocarp fibers with juice sacs attached. It is a somewhat problematic species. The only specimen examined with fruits, Holdridge 5118, has purple fruits and endocarp fibers with juice sacs attached. Otherwise, the species is close to B. caudata. I have retained it in this monograph following de Nevers et al. (1996). I suspect, however, that it is a member of the Central American orange-fruited group but more collections are needed to solve this problem. (Henderson, A.J., Bactris (Palmae) in Flora Neotropica Monographs 79. 2000)A

Description

  • Stems cespitose, forming dense to loose clumps, 3-4.5 m tall, 2-2.5 cm diam., spiny on internodes.
    Leaves 6-7; leaf spines black, terete, to 2(-6.5) cm long, dense or sparse on sheath, mostly absent or occasionally scattered on petiole and rachis; sheath 30-41 cm long; ocrea not seen; petiole 37-85 cm long; rachis to 135 cm long; pinnae 15-29 per side, regularly or irregularly arranged in distinct clusters, spreading in slightly different planes, linear to elliptical, caudate, with spines 1-2 cm long on the margins, rarely lacking spines; middle pinnae 30-72 x 3.5-7 cm.
    Inflorescences interfoliar; peduncle ca. 10 cm long, strongly recurved, spinulose; prophyll 7.5-15 cm long; peduncular bract 23-30 cm long, densely covered with erect, black or brown spines to 1 cm long; rachis 1.5-3 cm long; rachillae 20-30, 4.5-11 cm long, at anthesis densely covered with brownish or whitish trichomes and moniliform trichomes; triads irregularly arranged among paired or solitary staminate flowers; staminate flowers 3.5-5 mm long, more or less persistent after anthesis; sepal lobes 1-1.5 mm long; petals 3.5-5 mm long; stamens 6; pistillode absent; pistillate flowers to 5 mm long; calyx cupular, 1.5-3 mm long; corolla tubular, 4 mm long; staminodes absent; fruits 1.5-1.6 x 1.3-1.6 cm, obovoid, rostrate, purple; mesocarp juicy; endocarp turbinate, pitted at apex, the sterile pores slightly displaced longitudinally; endocarp fibers numerous, with juice sacs attached; fruiting perianth with small calyx and crenate corolla, without staminodial ring. (Henderson, A.J., Bactris (Palmae) in Flora Neotropica Monographs 79. 2000)A