262 



J. N. Rose: Oxalidaceae novae mexicanae. 



38. Lotoxalis tephrodes (Turcz.) Rose, 1. c, p. 116. 



Oxalis tephrodes Turcz., Bull. Soc. Nat. Mosc, XXXI, 428; 1858. 



39. Lotoxalis yucatanensis Rose, 1. c, p. 116. 



Ten to 30 cm high, erect, woody throughout; young parts with 

 ascending somewhat appressed pubescence; leaflets 3, the terminal 

 remote, oblong to orbicular, thin (in herbarium specimens), mostly rounded 

 at base, usually strongly emarginate, but the tips unequal, nearly 

 glabrous, 5 to 15 mm long; inflorescence of 5 to 7 flowers, dichotomous 

 with central flower solitary, compact, the pedicels jointed above the 

 base; sepals ovate, obtuse, 3 mm long, nerved, glabrous or nearly so; 

 corolla yellow; 5 longer filaments hairy; capsule orbicular ('?), glabrous 

 on the angles. 



Type U. S. National Herbarium no. 268419 (Gaumer, no. 715). 



Specimens examined: 



Yucatan, Schott, 1865 (no. 625); G. P. Gaumer, 1895 (no. 715); 

 C. P. Millspaugh, 1899 (no. 1633). 



This species has heretofore passed under the name of L. berlandieri, 

 but differs in its more erect shrubby habit and glabrous capsules, in 

 the character of its inflorescence, etc. It is apparently confined to 

 Yucatan. 



Pseudoxalis nov. gen. 



Probably perennial, caulescent from slender running rootstocks; 

 leaves alternate; stipules wanting; leaflets 3, palmate, sessile; peduncles 

 1 or 2-flowered; sepals 5, broad, thin, petaloid, much longer than the 

 petals; petals small, yellow. 



Perhaps nearest Xanthoxalis, from which it differs especially in its 

 small corolla and large petaloid sepals. When Oxalis madrensis was first 

 described it was compared by Doctor Watson with 0. (now Lotoxalis) 

 berlandieri, from which it differs especially in its foliage. 

 40. P. madrensis (S. Wats.) Rose, 1. c, p. 117. 

 Oxalis madrensis S. Wats., Proc. Am. Acad., XXV, 144; 1890. 

 Stems much branched, creeping, pubescent; leaflets obovate, obtuse 

 or retuse, 10 to 12 mm long; sepals obtuse, 6 to 8 mm long. 



Only known from mountains near Monterey, Nuevo Leon. Collected 

 by C. G. Pringle, July 16, 1889 (no. 2867). 



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