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VOL. 5] Plants of Sinaloa. 243 
blade 8 cm. long and less, 3-4 cm. wide and less; petiole, 1-1.5 
em. long: racemes axillary, shorter than the petioles, 4-5 
flowered: staminate flowers on pedicels 1 mm. long; bracts 
linear-lanceolate; sepals linear-lanceolate, 3 mm. long, equalling 
the ovate, acuminate petals; stamens from the column in two 
verticels; glands linear-acuminate: pistillate flower on a pedicel 
2mm. long; ovate-lanceolate, becoming 1 cm. long; petals small, 
2 mm. long, denticulate, spatulate-acuminate, attenuate to the 
base; glands % as long; ovary densely hirsute; styles slightly 
united at base, bifid less than % their length, not dilated above: 
capsule 6-7 mm. wide, flattened, somewhat hirsute: seed grayish, 
apiculate, indistinctly angled, flattened at ‘base and coarsely 
Tugose-reticulate. 
Collected near Culiacan, 1904. 
Specimens of an Argithamnia with characters similar to those 
of A. gracilis were collected at the same locality. They represent 
a frutescent species, the petals are more hirsute on the back, an 
there are other slight variations. It may be a distinct species, 
but it is possible for a perennial to have annual forms. 
Roulinia Sinaloensis. A twining vine; branches glabrous with 
a pubescent line above: leaves opposite, abruptly acuminate, 
deeply cordate, glabrous, lighter colored beneath, larger ones 10 
em. long, 6 cm. wide; petioles 3-5 cm. long: racemes usually 
shorter than the leaves, 3-7 flowered: buds ovate-acuminate; 
peduncles minutely pubescent in lines; pedicels 5-15 mm. long: 
calyx-segments linear-lanceolate, 5 mm. long: corolla segments 
ligulate, s mm. long, the edges incurved and the tip recurved: 
crown attached to the base of the column, parted into 5 3-lobe 
Segments that are united 3 mm. at the base, the short lateral 
lobes not incurved and appearing to be winged margins of the 
gradually acuminate central one, which nearly equals the corolla 
lobes; the thickened margins of the central lobe are continued 
Scmnward the length of the lateral lobes: anther tips oblong, 
rounded: stigma slightly 2-lobed, 5-rayed: pollinia oblong, on 
short narrow caudicles: mature follicles not seen. 
Climbing over bushes in the vicinity of Culiacan and Yervacito, 
Sinaloa, Mexico. March 5, 1908. 
