82 Contributions from the Gray Herbarium 



Guatemala: Barranca de Fuerengo, Oct. 1865, Bernoulli 105 

 (K).- T. 2. Fig. 59. The flowers are described by Bennett and 

 Chodaf (from F. Mueller 302, Orizaba, the type, in herb. Mart.) 

 as Bubsessile, bul the pedicels in all the specimens above cited are 

 1.2-1.5 mm. long and thus the longest of any species in the series. 

 Nevertheless their agreement in all other points with the descrip- 

 tions and ( nodat's figures is so close that I have little hesitation in 

 following Watson in referring the specimens quoted to this species. 



101. P. sphaerocephala Chod. Annual, 5-6 cm. high, simple 

 or corymbosely branched above. Cotyledons and basal leaves op- 

 posite, broadly spatulate, 3 mm. long, 2.5 mm. wide; leaves once 

 or twice verticillate below, the others alternate, 5-6 mm. long, 0.6- 

 1.5 mm. wide, those of the branches few and smaller. Racemes 

 terminal, capitate, 4.5-5 mm. thick, on naked peduncles 7-10 mm. 

 long; flowers 1-1.3 mm. long, on pedicels less than 1 mm. long. 

 Upper sepal broadly ovate, the lower ovate-lanceolate, acuminate. 

 Wings broadly lance-elliptic, obtuse or subacute, 3-nerved, exceed- 

 ing the corolla. Keel with a few-lobed crest. Upper petals broadly 

 rhomboidal, obtuse. Capsule elliptic. Seed ovoid, sparsely hairy. 

 Aril less than half as long as seed, its lobes spatulate. Chod. Bot. 

 Jahrb. lii. Beibl. 115. 80 (1914), as P. sphaerocephalum. Not 

 seen; described by Chodat from Seler 1222, from Patzcuaro, 

 Michoacan. 



102. P. turgida Rose. Fleshy perennial, many-stemmed, the 

 stems procumbent, whitish-green, angulate, glabrous, 1-3 dm. long. 

 Leaves verticellate throughout in 5's, or a few uppermost scattered, 

 spatulate-obovate, mucronate at the rounded apex, cuneate to 

 base, thick, fleshy, barely petioled, glabrous, 7-24 mm. long, 3.5-10 

 mm. wide. Racemes 1.5-(at last)9 cm. long, 5 mm. thick, straight 

 or curved, densely flowered, on peduncles 1.7-4.7 cm. long; pedi- 

 cels 0.5 mm. long or less. Flowers pinkish, 2.5-2.8 mm. long. 

 Upper sepal orbicular-ovate, obtusish, 1.5 mm. long, the lower del- 

 toid-ovate, obtuse, 1.3 mm. long, each marked with 4 oblong 

 whitish glands. Wings obovate, short-clawed, rounded at apex, 

 5-nerved, 2.8 mm. long, 1.5 mm. wide. Keel 2 mm. long; crest of 

 3 pairs of lobes, the posterior flabellate-cuneate, the anterior 2 

 oblong, entire or barely bifid. Upper petals elliptic, rounded or 

 subtruncate at apex, barely erose on margin, 1.9 mm. long. Cap- 

 sule orbicular-ovate, 1.4 mm. long, 1.2 mm. wide. Seed short- 



