Oxalis enneaphylla (D.C. Parda? i.702) collected on the Falkland Islands.

Maximum parsimony strict consensus topologies from separate nrITS (88 sequences from 76 individuals, 760 sites, 30% pars. informative) and plastid (71 accessions, 2867 sites, <8% informative) datasets. Bolded species names indicate distylous individuals. Parsimony bootstrap scores are above branches and Bayesian posterior probabilities are below. Incongruence occurs in the placement of O. rosea, and in the order of divergence in the Andean lineages.

Bayesian 50% majority-rule consensus topology of combined nrITS and plastid datasets with Bayes Multistate reconstruction of ancestral geographic states. Pie graphs represent the distribution of posterior probabilities of ancestral states for each node. Colors represent the geographic coding (Red: Patagonia; Green: SE South America; Purple: Andes; Turquoise: Central America and southern Mexico; Orange: MTVB and north; Dark Blue: Africa). Provinces/departments/states are shaded on the maps based on the distributions of taxa represented by the phylogeny, based on data from Denton (1973) and Lourteig (2000). The widely-distributed weeds O. debilis and O. latifolia are not mapped.

Morphology and geography of the American bulb-bearing Oxalis. Colors represent the geographic coding we use when reconstructing ancestral geographic states (Red: Patagonia; Green: SE South America; Purple: Andes; Turquoise: Central America and southern Mexico; Orange: MTVB and north; Dark Blue: Africa). Provinces/departments/states are shaded based on the number of species represented in each of the sections Articulatae, Palmatifoliae, Pseudobulbosae, and Ionoxalis—those with greater species diversity are more saturated with color. The widely-distributed weeds O. debilis and O. latifolia are not mapped. Representatives of each section are depicted at the same scale. Data from Denton (1973) and Lourteig (2000); illustrations from Rose (1906), Knuth (1930), Denton (1973), and Lourteig (2000).

Distribution of American bulb-bearing Oxalis collections (white dots) and precipitation seasonality (aseasonal-green, extremely seasonal precipitation-red).  Oxalis collections are from georeferenced herbarium specimens, precipitation seasonality is from the WORLDCLIM dataset.

I’m thinking about rescaling the precipitation seasonality dataset using latitude, so that areas where precipitation falls as snow for several months are re-scored as being more seasonal.  This would raise the values for areas like Tierra del Fuego and northern North America, perhaps better reflecting the accessibility of precipitation.

Oxalis enneaphylla, Torres del Paine NP, Chile, Walking tour from Hosteria Mirador del Paine to Sierra Toro.  Tristylous longs.

http://www.flickr.com/photos/rienpieterman/

Oxalis adenophylla. Bariloche, Rio Negro, Argentina, Nov 12.

http://www.flickr.com/photos/gjshepherd/

Submitted a National Science Foundation Doctoral Dissertation Improvement Grant today. This is the most interesting figure…

The American bulb-bearing Oxalis exhibit dramatic variation in underground storage morphology along two fairly easily measurable axes: X) number of bulbscales per mm of stem axis (how condensed the bulb is), and Y) number of bulblets produced per growing season (how much allocation to asexual propagation).

Oxalis adenophylla, a mid-flowered individual from our greenhouse.  This species is native to Patagonia, but commonly grown for its attractive leaves and showy flowers.

Distribution of Oxalis section Palmatifoliae by state/province/dept.  This group centered in Patagonia.  Data from Lourteig, 2000.

Knuth.

Oxalis lacinta.

Oxalis squamosa-radicosa.