Solanaceae Source

A global taxonomic resource for the nightshade family

Revision of Solanum flahaultii from Thu, 2013-12-19 16:21

Citation author: 
Bitter
Citation: 
Repert. Spec. Nov. Regni Veg. 12: 57. 1913.
Type: 
Colombia. Cundinamarca: Bogotá, Quebrada de San Francisco, 26 Jun 1909, Apollinaire 331 (holotype, MPU [unnumbered photo obtained by Bob Taylor, Beltsville Maryland USA, G, MO-5608703, NY]; isotype, P).
Last edited by: 
Spooner, D.M.
Written by: 
Spooner, D.M. & D. Fajardo
Habit: 
Herbs 40-80 cm tall, semierect to erect. Stems 3-5 mm in diameter at base of plant, green to green mottled with purple, with straight and narrow wings less than 0.8 mm wide, densely pubescent; tubers typically moniliform (multiple tubers arranged along the stolon like beads on a necklace).
Sympodial structure: 
Sympodial units tri- to plurifoliate, not geminate.
Leaves: 
Leaves odd-pinnate, the blades 5.5-14 x 2.5-10.5 cm, medium green, membranous to chartaceous, sparsely pubescent adaxially, densely pubescent abaxially; lateral leaflet pairs 1-3, subequal or the size of the leaflets decreasing gradually from the leaf base, with the terminal leaflet larger than laterals; most distal lateral leaflets 1.5-5.2 x 0.8-2.5 cm, ovate to elliptic, the apex slightly acuminate, the base sessile to subsessile, symmetrical to more commonly asymmetrical with more tissue on the basiscopic side; terminal leaflet 2.8-9 x 1.2-4.5 cm, ovate, the apex somewhat acuminate, the base attenuate, with secondary leaflets on the petiolule absent; interjected leaflets usually absent, rarely up to 4, sessile, ovate to orbicular; petioles 1-4.2 cm, densely pubescent with hairs like those of the stem. Pseudostipules minute to 10 mm long, pubescent with hairs like those of the stem.
Inflorescences: 
Inflorescences 5-9.5 cm, terminal with a subtending axillary bud, generally in distal half of the plant, usually forked, with 5-10 flowers, with all flowers apparently perfect, the axes pubescent with hairs shorter than those of the stem; peduncle 1-5 cm long; pedicels 10-30 mm long in flower and fruit, spaced 1-10 mm apart, articulated between the middle to the proximal ¼.
Flowers: 
Flowers homostylous, 5-merous. Calyx 6-11 mm long, the tube 1-2 mm, the lobes 3-7 mm, long attenuate, the acumens 0.7-3 mm long, pubescent with hairs like the stems. Corolla 2.2-2.9 cm in diameter, pentagonal to rotate, light blue-violet to purple, the rays pale violet or white, the tube 1-2 mm long, the acumens 1-3 mm long, the corolla edges flat, not folded dorsally, glabrous adaxially and abaxially, ciliate at the margins, especially at the tips of the corollas. Stamens with the filaments 1-2 mm long; anthers 3-4 mm long, lanceolate, connivent, yellow, poricidal at the tips, the pores lengthening to slits with age. Style 5-6 mm x 0.4-0.5 mm, exceeding stamens by 1.5-3 mm, straight, glabrous; stigma capitate.
Fruits: 
Fruit a conical berry, 1.3-2.2 cm long, 1-1.8 cm wide, light green when ripe, glabrous.
Seeds: 
Seeds from living specimens ovoid and ca. 2 mm long, whitish to greenish in fresh condition and drying brownish, with a thick covering of “hair-like” lateral walls of the testal cells that make the seeds mucilaginous when wet, green-white throughout; testal cells honeycomb-shaped when lateral walls removed by enzyme digestion.
Chromosome number: 

2n = 4x = 48 voucher: Castillo et al. 1272 (PTIS) (Hijmans, et al. 2007)

Distribution: 

Southwestern to northeastern Colombia (Depts. Cundinamarca, Boyacá, Meta, Santander and Cauca), in moist habitats, at forest edges and along roadsides; 2500-4310 m in elevation.

Phenology: 
Flowering and fruiting from April to November.
Phylogeny: 

Solanum flahaultii is a member of Solanum sect. Petota Dumort., the tuber-bearing cultivated and wild potatoes. Within sect. Petota, Solanum flahaultii is a member of a distinctive group of species formerly classified in series Conicibaccata (see below). On a higher taxonomic level, it is a member of the informally-named Potato Clade, a group of perhaps 200-300 species that also includes the tomato and its wild relatives (Bohs, 2005).

Commentary: 

Hawkes (1990) treated Solanum flahaultii as one of 40 species in Solanum sect. Petota series Conicibaccata Bitter, a group containing diploids (2n = 24), tetraploids (2n = 48), and hexaploids (2n = 72). The polyploids are mainly distributed from southern Mexico south to central Peru (one species in northern Bolivia), and the diploids from northern Peru to central Bolivia.

The species boundaries and relationships of members of series Conicibaccata have been studied using plastid DNA restriction sites (Castillo and Spooner, 1997), morphology (Castillo and Spooner, 1997; Fajardo et al., 2008), AFLPs (Jiménez et al., 2008), nuclear DNA (“waxy”) sequence data (Spooner et al., 2008), other nuclear DNA sequence data (in preparation by Fajardo and Spooner), and monographic studies (Hawkes, 1990; Hawkes and Hjerting, 1989; Ochoa, 1990, 1999). The plastid DNA restriction site and morphological data divide the diploids and polyploids into two clades or phenetic groups, respectively, but the morphological separation generally depends on the use of character states that sometimes overlap in range. The DNA sequence data show the polyploids to be of allopolyploid origin from the diploid members of the series and members of species outside of the series.

A monographic study in progress by Fajardo and Spooner, using the above data, and herbarium specimens, will recognize only 17 species. All are very similar, united as a group by conical fruits, leaves with generally parallel sided morphology, and narrowly ovate to elliptical leaflets. However, some unrelated species also have conical fruits, such as the Mexican diploid species S. hintonii Correll, S. lesteri Hawkes and Hjert. and S. trifidum Correll; the Mexican hexaploid species S. iopetalum (Bitter) Hawkes; and the Bolivian species S. circaeifolium Bitter. An additional problem is that some species possess ovoid fruits that are not absolutely distinct from the conical fruits of the above species or the globose fruits more common in the majority of the members of sect. Petota.

Solanum flahaultii is one of four Colombian species in series Conicibaccata and is characterized by its densely pubescent leaves, calyx and pedicels; slightly acute elliptical to ovate leaflets with the terminal leaflet larger than the laterals; lack of interjected leaflets; and pentagonal to rotate and purple to light violet corollas.

References: 

Hawkes, J.G. & J.P. Hjerting 1989. The potatoes of Bolivia: their breeding value and evolutionary relationships.
Oxford University Press, Oxford.

Hawkes, J.G. 1990. The potato: evolution, biodiversity and genetic resources.
Oxford: Belhaven Press.

Castillo-T., R., & D.M. Spooner 1997. Phylogenetic relationships of wild potatoes, Solanum series Conicibaccata (sect. Petota).
Syst. Bot. 22: 45-83.

Ochoa, C.M. 1999. Las papas de sudamerica: Peru (Parte I).
Lima, Peru: International Potato Center.

Bohs, L. 2005. Major clades in Solanum based on ndhF sequences.
Pp. 27-49 in R. C. Keating, V. C. Hollowell, & T. B. Croat (eds.), A festschrift for William G. D’Arcy: the legacy of a taxonomist. Monographs in Systematic Botany from the Missouri Botanical Garden, Vol. 104. Missouri Botanical Garden Press, St. Louis.

Hijmans, R., T. Gavrilenko, S. Stephenson, J. Bamberg, A. Salas & D.M. Spooner 2007. Geographic and environmental range expansion through polyploidy in wild potatoes (Solanum section Petota).
Global Ecol. Biogeogr. 16: 485-495.

Spooner, D.M., F. Rodríguez, Z. Polgár, H.E. Ballard Jr. & S.H. Jansky 2008. Genomic origins of potato polyploids: GBSSI gene sequencing data.
The Plant Genome, a suppl. to Crop Sci. 48 (S1): S27–S36.

Jiménez, J.P., A. Brenes, A. Salas, D. Fajardo & D.M. Spooner 2008. The use and limits of AFLP data in the taxonomy of polyploid wild potato species in Solanum series Conicibaccata.
Conserv. Genet. 9: 381-387.

Fajardo, D., R. Castillo, A. Salas, & D.M. Spooner 2008. A morphometric study of species boundaries of the wild potato Solanum series Conicibaccata: a replicated field trial in Andean Peru.
Syst. Bot. 33: 183-192.

Taxonomic name: 
Solanum flahaultii (Solanaceae)
Wed, 2013-11-20 10:59 -- sandy
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