166 TEXAS RESEARCH FOUNDATION: CONTRIBUTIONS, VOLUME 5 
one-half inch diam.; Chichavac, in heavy forest, alt. 8-9000 ft., July 9, 1933, Alexander F. 
Skutch 377 (A, F), shrub 6 ft. high, fls. pink. QuicnE: Nebaj, in low forest, ca. 13 km. n., on 
Cotzal Road, alt. 6000 ft., July 1, 1964, Elias Contreras 5147 (LL), shrub, 1 in. diam., 7 ft. 
high; Nebaj, in high forest, ca. 10 km. w., alt. 8000 ft., July 3, 1964, Elias Contreras 5189 
(LL), shrub, 2 in. diam., 7 ft. high, ‘‘cuxma’’; valley of Rio de las Violetas, n. of Nebaj, on wet 
bank beside waterfall, 5800-6000 ft., July 22, 1964, George R. Proctor 25227 (LL), shrub, 1.5 
m.; Falls of Rio de las Violetas, 2.5 miles n. of Nebaj, c. 5500 ft., Aug. 7, 1954, George R. 
Proctor 25448 (LL), shrub, 2.5 m., fr. green. Santa Rosa: Zamorora, alt. 5500 pp., Apr. 1893, 
Enrico Teophilo Heyde & Ernesto Lux 4535 (A, F, G, GH, MICH, MO, NY, US). INDEFINITE: 
Palencia, alt. 1480 m., Feb. 1928, Morales 942 (US). 
In the Skutch specimens, the filaments are slightly shorter than the anthers, 
but otherwise the collections agree quite well with the type of P. leptopa. Heyde 
& Lux 4535 from Zamorora, Guatemala, is a mixture of P. refleca Brandeg. 
with P. leptopa, and the specimens of P. reflera have been designated 4535 A. 
The anthers in the species are variable in size, some being quite slender, but 
all have the small reddish glands dorsally, and these are usually few and in- 
conspicuous. 
64. PARATHESIS TENUIS Standl., Contr. U. S. Nat. Herb. 23:1111. 1924; 
Schultes, Bot. Mus. Leafl. 9: 187-190, pl. 8. 1941. Fig. 62 and Plate 29. 
Small tree, up to 5 m. high, branchlets slender, minutely tomentulose; leaves 
with slender petioles 3-9 mm. long; leaf blades elliptic or lanceolate-elliptic, 
3.5-6 em. long, 1-2 em. wide, apex caudate-acuminate, cuspidate, base cuneate, 
membranaceous, entire or essentially so, glabrous, costa prominent, the primary 
lateral veins very slender; inflorescences axillary, simple or 1-branched, panicu- 
late, shorter than leaves, sparsely and minutely puberulent, the peduncle long 
and filiform; pedicels filiform, 5-9 mm. long; flowers corymbose, up to 3 mm. 
long at anthesis, minutely tomentulose; sepals narrowly triangular, about 0.75 
mm. long, orange-punctate; petals linear-lanceolate, about 3 mm. long, orange- 
punctate in lines, short papillose-tomentose within apically and along edges; 
stamens 2 mm. long; filaments short and slender, about 1.3 mm. long, glabrous; 
anthers narrowly triangular, up to 1.5 mm. long, acuminate, dorsifixed about 
one-fourth above base, epunctate dorsally or sometimes with one or two small 
black glands above attachment; ovary ovoid, finely and minutely tomentulose; 
style about 2.5 mm. long, slender, puberulent basally; placenta subglobose, 
apiculate; ovules 3 or 4, uniseriate, minute, erect, enclosed; fruit depressed- 
globose, drying 5-6 mm. in diam., shallowly costate. 
MEXICO.—Oaxaca: District of Choapam, Cerro Caracol, between San Juan Lalana and 
Santo Domingo Latani, lat. 17° 26’, long. 95° 49’, alt. 1400-1650 m., May 11, 1939, Richard 
Evans Schultes & Blas Pablo Reko 865 (LL), small slender tree up to 15 ft. tall, sepals small 
and brown, corolla white, brown-spotted, stamens large and yellow, conspicuously reflexed 
corolla showing stamens, fruits small, edible, “‘ma-ku-lai.”” INDEFINITE: June, 1842, F. M. 
Liebmann 14 (US, type; C, F, GH, LL, MICH, NY, isotypes); Sierra San Pedro Nolasco, 
Talea, & c., 1843-4, C. Juergensen s.n. (G). 
P. tenuis is a rarely collected species notable for its simple or 1-branched 
filiform inflorescences, small leaves, small flowers, slender acuminate anthers 
eglandular or with one or two black dorsal glands, and minute placenta with 
only 3 or 4 enclosed ovules. 
