56 NORTH AMERICAN FLORA [Volume 25 



the more or less narrowed apex, finely pubescent on both sides ; peduncles longer than the 

 petioles ; pedicels appressed-pubescent, not refracted at maturity ; sepals petaloid, some- 

 what accrescent and with thin pink or purple tips, 9-11 mm. long at maturity; petals 

 yellow, about twice as long as the sepals during anthesis ; longer filaments pubescent, 

 narrower than the shorter ones; capsules columnar, as long as the sepals or slightly longer. 



Type locality : Near Monterey, Mexico. 

 Distribution : Known only from the type locality. 



24. Xanthoxalis crassicaulis (Zucc.) Small. 



Oxalis crassicaulis Zucc. Denks. Akad. Muench. 9 : 163. 1825. 



Stems erect, mostly 2-4 dm. tall, more or less hirsute especially on younger parts, aris- 

 ing from rootstocks which bear clavate or obovoid tubers ; leaflets bright-green, the blades 

 15-25 mm. wide, rather fleshy, obcordate, somewhat hirsute on both sides ; peduncles 

 mostly longer than the petioles, hirsute; pedicels villous-hirsute, erect in fruit ; sepals 11- 

 13 mm. long at maturity, linear to narrowly linear-lanceolate, pubescent, especially near 

 the tips ; petals yellow, 15-22 mm. long ; longer filaments pubescent, prominently appen- 

 daged on the back ; capsules narrowly oblong. 



Type locality : Peru. 



Distribution : Cultivated in Mexico and perhaps locally naturalized. Introduced from Peru. 



Illustration : Abh. Akad. Muench. 1 : pi. S. 



25. Xanthoxalis clematodes (Donn. Smith) Small. 



Oxalis clematodes Donn. Smith, Bot. Gaz. 18 : 198. 1893. 



Stems woody, the elongate branches reclining, with reddish bark and scattered 

 deciduous hairs, the twigs densely hirsute ; leaves clustered on the branchlets, the pet- 

 ioles pubescent like the twigs ; the blades of the leaflets obovate, 8-14 mm. broad, rounded 

 or emarginate at the apex, rather copiously pubescent on both surfaces when young, thinly 

 so in age ; peduncles longer than the petioles ; pedicels strigillose, not refracted in fruit ; 

 sepals 4.5-5 mm. long at maturity; petals yellow, 10-14 mm. long; longer and shorter 

 filaments pubescent ; capsules cylindric-conic, 6-7 mm. long, acute, densely strigillose, 

 somewhat surpassing the sepals. 



Type locality: San Miguel Uspatitan, Guatemala. 

 Distribution : Known only from the type locality. 



26. Xanthoxalis acuminata (Schlecht. & Cham.) Small. 



Oralis acuminata Schlecht. & Cham. Linnaea 5 : 224. 1830. 

 ? ( ) talis Lindeni Turez. Bull. Soc. Nat. Mosc. 31 1 : 429. 1858. 



Stems and spreading branches finely pubescent at least when young, less pubescent 

 and becoming red or purple in age ; leaves mostly approximate or crowded on short 

 branchlets, the petioles finely appressed-pubescent, the blades of the leaflets ovate to 

 rhombic-ovate, 1.5-4.5 cm. long, acuminate at the apex, bright-green and more or less 

 appressed-pubescent above, slightly paler and more pubescent beneath, those of the lateral 

 leaflets less decidedly acuminate than that of the terminal one ; peduncles about as long as 

 the petioles; pedicels appressed-pubescent, mostly 3-5 mm. long; sepals 4.5-5 mm. long, 

 the outer ones oblong-lanceolate, ciliate and more or less pubescent on the back ; petals 

 yellow, fully twice as long as the sepals ; longer filaments pubescent ; styles pubescent ; 

 capsules not seen. 



Type locality : Vera Cruz, Mexico. 

 Distribution : Mexico and Central America. 



Doubtful species 



Oxalis autumnalis Poepp. ; Prog, in Mart. Fl. Bras. 12* ; 477. Described thus: 

 " Capsula ovata, calycem vix excedens ; foliola subsessilia ; corolla flava," and said to 

 occur in Peru and Mexico. 



