Part 2, 1910] ZYGOPHYLLACEAE 105 



4. Fagonia pachyacantha Rydberg, sp. nov. 



An undershrub, 3-6 dm. high ; branches yellowish or straw-colored, viscid, with glandular 

 hairs, striate and somewhat angled ; stipules stout, subulate, 6-10 mm. long, spreading or 

 somewhat reflexed, longer than the petioles; petioles 5-8 mm. long, spreading; leaflets 3, 

 linear, 8-15 mm. long, about 1 mm. wide, thick, glandular ; peduncles 3-5 mm. long ; 

 sepals ovate-lanceolate, 3 mm. long, with very short spinulose tips ; petals rose-purple, 6-8 

 mm. long; blades obovate-spatulate ; fruit 5 mm. long, reticulate, pubescent, the hairs 

 with thickened bases ; beak about 2 mm. long. 



Type collected in Lower California [date and exact locality not given], Leon Diquet (herb. N. 

 Y. Bot. Gard.). 



Distribution : Known only from the type locality. 



5. Fagonia Palmeri Vasey & Rose, Contr. U. S. Nat. 

 Herb. 1 : 82. 1890. 



Branched undershrub, 2-8 dm. high or more ; branches yellowish, strongly angled, 

 striate, finely glandular ; stipules very slender, ascending or divaricate, 5-8 mm. long ; peti- 

 oles 8-15 mm. long, glandular; leaflets 5-7, linear, 8-15 mm. long, about 1 mm. broad, 

 thick, glandular-puberulent, spinulose-tipped ; peduncles 2-4 mm. long ; sepals lanceolate, 

 3 mm. long, with short spinulose tips; petals pinkish or rose, about 6-8 mm. long ; blades 

 spatulate ; fruit about 4 mm. long, muricate-hispidulous ; beak fully 3 mm. long. 



Type locality: Santa Rosalia, Lower California. 



Distribution: Lower California. 



2. GUAIACUM L. Sp. PI. 381. 1753. 



Trees or shrubs with hard resinous wood and stout branches, often beset with swollen 

 or articulate nodes. Leaves petiolate, opposite, abruptly pinnate. Leaflets 2-14 pairs, 

 entire, reticulate-veined, inequilateral. Stipules minute, more or less caducous. Flowers 

 pedunculate from the axils of minute deciduous bracts. Sepals 4 or 5, somewhat united at 

 the base, unequal, imbricate. Petals blue or purple, 4or 5, obovate, more orlessunguiculate, 

 imbricate, deciduous. Stamens 8-10, inserted on the short elevated inconspicuous disc. 

 Filaments filiform, naked at the base. Anthers oblong, cordate or sagittate. Pistil of 2-5 

 carpels. Ovary obovate or clavate, raised on a short stalk, 2-5-lobed and 2-5-celled, con- 

 tracted into a slender subulate style. Stigma entire or 2-5-toothed. Ovules 8-10 in each 

 cell, pendulous, anatropous. Fruit smooth, coriaceous, with 2-5 wing-like angles, septi- 

 cidal. Seeds solitary, ovoid. Embryo straight or nearly so, with flat cotyledons. 



Type species, Guaiacum officinale L. 



Petals tomentulose ; fruit usually 2-carpellary; leaflets oval to broadly obovate. 1. G. officinale. 

 Petals glabrous ; fruit usually 3-5-carpellary. 



Leaflets oblong to obovate. 2. G. sanctum. 



Leaflets linear or linear-oblong. 

 Ovary glabrous. 



Petals oblong-obovate, thin ; leaflets strigose beneath. 3. G. guatemalense. 



Petals broadly obovate ; leaflets glabrous or nearly so. 



Leaflets 10-25 mm. long ; petals thick ; outer sepals broadly oval, 



4 mm. long; flowers clustered. 4. G. Coulteri. 



Leaflets 8-12 mm. long ; petals thin ; outer sepals elliptic, 6 mm. 

 long ; flowers solitary. 5. G Planckoni. 



Ovary tomentose ; petals orbicular-obovate. 6. G. Palmeri. 



1. Guaiacum officinale L,. Sp. PI. 381. 1753. 



Guaiacum bijugum Stokes, Bot. Mat. Med. 2 : 486. 1812. 



A low or medium-sized evergreen tree, 3-10 m. high, with crowded flexuose branches 

 and a thick smooth gray bark ; leaves 3-9 cm. long ; leaflets 4-6, mostly 4, oval to broadly 

 obovate, 1-5 cm. long, glabrous, reticulate, rounded at the apex, entire, somewhat inequi- 

 lateral, sessile or subsessile, at maturity becoming coriaceous ; stipules pubescent, 1 mm. 

 long, acute, caducous ; flowers terminal, few or many, borne on slender pubescent pedun- 

 cles ; sepals ovate to orbicular, 5-7 cm. long, tomentulose on both surfaces, the apex rounded 

 or rarely mucronate ; corolla blue or white ; petals 5, narrowly obovate, 12-13 mm. long, 

 7-8 mm. broad, mucronate or rounded, tomentulose (sometimes on both surfaces) at the 



