544 PATAGONIAN EXPEDITIONS I BOTANY. 



TROP^GOLUM POLYPHYLLUM MYRIOPHYLLUM P. & E. 



Stem slender ; lobes of leaves lanceolate or linear, often again lobed. 

 (Chili) ; Patagon., Chubut. 



MAGALLANA Cav. (sub Tropceolum auct.) 



Calyx-lobes, the 2 anterior deeply parted ; 3 posterior connate but 3- 

 toothed. Stamens united at very base. Fruit 3-winged, abortively i- 

 seeded. 



M. PORRIFOLIA Cav. 



Annual, climbing on hedges. Leaves 3-partite ; their lobes linear, 

 entire. "Root with globose or ellipsoid tubers, white inside." (Speg.) 



S. Amer., to Puerto Deseado in S. Patagon., "not rare in gravels along 

 Rio Sta. Cruz, in 1882 (C. Speg.) and San Julian, in 1882 (Torini del 

 Furia)." Valley of Rio de Mayo. (Bentham and Hooker regard it as a 

 depauperate form of Tropceolum pentaphyllum Lam., described with an 

 alien fruit.) 







Family 56. ZYGOPHYLLACE^E. 



Usually shrubs, with opposite, stipulate, pinnate or 2-3-foliolate leaves, 

 the leaflets entire ; and with perfect, ^-mtrousfawers on axillary peduncles, 

 sometimes apetalous. Stamens 1-3 times as many as the sepals, hypo- 

 gynous. Ovary 4-i2-celled ; style simple. Fruit mostly capsular, divid- 

 ing into segments. Seeds with or without endosperm. 



Species 150 in warm climates. 



KEY TO THE GENERA. 



A. Filaments with lacerous basal scales. Ovary short-stiped, becoming a 5 -winged fruit. Broom- 

 like shrubs. Leaves odd-pinnate. I. Bulnesia. 

 A2. Filaments with a 2-3-cleft basal scale. Ovary sessile. Fruit 5-coccous, villous. Leaves 

 twice- pinnate. Branches nodose, distichous. 2. Larrea. 



i. BULNESIA Gay. 



Broom-like shrub, with sparse, small, evenly pinnate leaves, the leaflets 

 oblong-mucronate. Stiptiles broad, ovate. Sepals unequal. Petals as 

 long, clawed. Stamens 10, the filaments with adnate, basal scales. Omtles 

 numerous; mericarps winged, i -seeded, dehiscing. 



