44 TEXAS RESEARCH FOUNDATION: CONTRIBUTIONS, VOLUME 5 
Schipp S-405 is a mixture of P. rufa and P. sessilifolia Donn. Sm. The speci- 
mens referable to P. sessilifolia are designated S-405A. 
11. PARATHESIS PRIONOPHYLLA Standl., Proc. Biol. Soc. Wash. 37:46. 1924. 
Fig. 11. 
Shrub, 2-2.5 m. high, twigs rather stout, densely tomentose with reddish- 
brown dendroid hairs; leaves with rather stout petioles, the petioles tomentose, 
glabrescent above, canaliculate, up to 1 cm. long; leaf blades elliptic or oblong- 
elliptic, 12-16 em. long, 5.5-7 cm. wide, acute or acuminate, cuneate and decur- 
rent on petiole at base, chartaceous, paler beneath, obscurely bizonal, the pubes- 
cence of costal zone consisting of fine reddish stellate hairs, sessile or short 
stalked, densest along costa, the pubescence of marginal zone of very fine closely 
appressed stellate hairs, pellucid-punctate, margin coarsely serrate-dentate, the 
teeth up to 5 mm. long, the costa prominent beneath, nearly plane above, the 
lateral veins slender, slightly impressed or plane above; inflorescences terminal, 
many-flowered, rather congested, up to 13 em. long, pyramidal, tomentose with 
short reddish-brown stellate hairs; flowers corymbose or subracemose-corym- 
bose; the pedicels 3-5 mm. long; flower buds before anthesis ovoid, up to 7 mm. 
long, stellate-tomentulose with reddish-brown hairs, the calyx and corolla black- 
punctate in lines; sepals triangular, 2-2.5 mm. long, acuminate; petals linear- 
lanceolate, up to 7 mm. long, papillose-tomentose within apically and along 
edges; stamens 3-3.5 mm. long; filaments glabrous, stout, up to 1.8 mm. long; 
anthers erect, lanceolate-oblong, up to 2.6 mm. long, apex rounded and apiculate, 
dorsifixed, the lobes appressed to filaments, with a conspicuous rather small 
black-punctate triangular area above point of attachment; ovary hirsute apically, 
not densely so, the style slender, about 5 mm. long, pubescent at base; placenta 
minute, subglobose, the ovules 6 or 7, uniseriate, enclosed. 
MEXICO.—Nayanirt: Tepic, Jan. 5—Feb. 6, 1892, Edward Palmer 1988 (F, GH, NY, US); 
Arroyo de Jalco, alt. 540 m., Apr. 1, 1923, Jesus Gonzalez Ortega 52 (US, type; GH, isotype), 
2 m., flor rosa, ‘‘capulincillo de faisan’’; 14-17 miles west of Tepic along road over mountain 
to Jalcocotan, elev. 3000-4000 ft., June 24, 1951, H. S. Gentry & C. L. Gilly 10670 (LL), 
shrub 2-2.5 m., flowers pink. 
The isotype at Gray Herbarium, with the original Ortega label, bears the 
number 6.252. The teeth of the leaf margin in the Edward Palmer collection 
are coarse but irregular, a similar condition being found in some collections of 
P. ferruginea Lundell. 
Represented by only three collections, P. prionophylla, the northernmost 
species of the Pacific slope of Mexico, is recognizable by its coarsely serrate- 
dentate leaves bizonal beneath, and comparatively large sepals. In flower and 
sepal size, it approaches P. chiapensis Fernald. Also, it has many features in 
common with P. ferruginea. 
In P. prionophylla the sessile or short-stalked stellate hairs of the costal zone 
of the lower surface of the leaf are loose and spreading. 
12. PARATHESIS PARVIFOLIA Lundell, Wrightia 3: 70. 1963. Fig. 12 and Plate 4. 
Shrub, branchlets slender, red tomentose with stalked multibranched rather 
coarse dendroid hairs, glabrescent; leaves with short canaliculate petioles 2-6 
mm. long, the petioles tomentose beneath, papillose-puberulent above at first; 
