Part 2, 1910] ZYGOPHYLLACEAE 115 



2. Morkillia acuminata Rose & Painter, Smiths. Misc. 

 Coll. 50' : 34. 1907. 



A shrub 3-5 m. high, with yellowish- white bark ; young twigs densely white-tomentose ; 

 leaflets 3-9, petiolulate, ovate, acuminate, 1-3 cm. long, densely grayish-tomentulose above, 

 villous-tomentose beneath ; stipules subulate, caducous; sepals elliptic, acute, about 1 cm. 

 long ; petals 2.5-3 mm. long, obovate, barely notched ; fruit about 5 cm. long, the wings 

 broad, slightly produced at the apex, with rounded spreading lobes, with a very broad open 

 sinus, making the fruit almost truncate at the apex. 



Type locality: Road over mountains between Victoria andjaumave Valley [Tamaulipas] . 



Distribution : Known only from the type locality. 



8. VISCAINOA Greene, Pittonia 1 : 163. 1888. 



Low shrubs. Leaves alternate, short-petioled, simple, or odd-pinnate with 3-5 leaf- 

 lets. Peduncles opposite the leaves, 1-5-flowered. Sepals 5, caducous. Petals obovate, 

 short-unguiculate. Stamens 10, unappendiculate. Anthers lanceolate. Ovary 3-5-celled, 

 stipitate. Styles 3-5 (commonly 4), united into a short clavate 3-5-angled and lobed 

 beak, stigmatose on the lobes. Fruit a pendulous coriaceous 4- (rarely 3- or 5-) lobed in- 

 flated capsule, terminated by the stout beak-like persistent styles, the lobes separating 

 from the slightly cohering columnar placentae into narrow cymbiform beaked valves. Seeds 

 2 in each cell, suspended from near the summit of the column. 



Type species, Staphylea geniculate!. Kellogg. 



1. Viscainoa geniculata (Kellogg) Greene, 

 Pittonia 1 : 163. 1888. 



Staphylea geniculata Kellogg, Proc. Calif. Acad. 2: 22. 1859. 



A low cinereous-pubescent shrub with stoutish, rigid and crooked branches ; leaves 

 alternate, simple (or pinnately 3-5-foliolate, according to Brandegee); blades or leaflets cune- 

 ate-obcordate, or obovate or oval, 2-5 cm. long, 1-3 cm. broad, obtuse, apiculate or retuse, 

 coriaceous, reticulate-veiny, minutely pubescent on both surfaces, yellowish-green, the mar- 

 gins entire ; stipules subulate, caducous or persistent ; peduncles 2.5-5 cm. long or more, 

 tomentulose, 1-5-fiowered ; pedicels about 15 mm. long, slender, pubescent ; sepals oblong, 

 8-9 mm. long, acutish, pubescent ; petals obovate, obtuse, short-unguiculate, ochroleu- 

 cous ; filaments short, subulate ; anthers 4 mm. long ; ovary short-stipitate, orbicular in 

 outline, 2 mm. long, 4-angled, densely pubescent ; style thick, sulcate, lobed at the 

 apex, the free lobes stigmatose on the margins ; capsule 2-3 cm. long, pendulous on 

 a geniculate pedicel, obovoid in outline, 3-5-lobed, usually 4-lobed, acute at each end, 

 reticulate-veiny, tomentulose; seeds 6-7 mm. long, oblong-ovoid or ellipsoid, nearly black, 

 shiny, covered with a thin, dull-brown, sticky aril ; endosperm thick and bony; cotyledons 

 oblong, 2-3 mm. long, yellow. 



Type locality : Near shore of Bay of San Sebastian Viscaino, Lower California. 



Distribution : Lower California and Sonora. 



9. SERICODES A. Gray, PI. Wright. 1 : 28. 1852. 



Shrubs. Leaves simple, stipulate, fascicled in alternate fascicles. Sepals 5, barely 

 united at the base, persistent. Petals 5, inserted below the calyx. Stamens 10, hypo- 

 gynous. Filaments filiform, the 5 opposite the petals naked, the 5 alternating arising 

 from a deeply bifid pilose scale. Anthers introrse, affixed slightly below the middle. Ovary 

 5-lobed, 5-celled, sessile, densely pilose. Style 5-angled above, clavate, stigmatose at the 

 angles. Ovules solitary, pendulous. Fruit a dry 5-celled pilose capsule that easily separates 

 into 5 triangular indehiscent nutlets. Seeds thin, oblong, with a long acutish apex, without 

 endosperm. Cotyledon ovate-oblong. 



Type species, Sericodes Greggii A. Gray. 



