212 NORTH AMERICAN FLORA [Volume 25 



2. Thamnosma montana Torr. & Frem. in Frem. Rep. 313. 1845. 

 A strong-scented glandular shrub, 3-6 dm. tall, with rigid, often spine-like branches, 

 and yellowish-green bark ; leaves few, early deciduous, linear to spatulate-linear or oval, 

 5-10 mm. long, sessile ; flowers in loose terminal racemes; sepals triangular to semiorbicu- 

 lar, acute or rounded at the apex ; petals nearly erect, purple, oblong to oval, 8-14 mm. 

 long, 4-5 mm. broad ; filaments filiform ; anthers oval or ovate, apiculate ; ovary stipitate ; 

 style exserted ; capsule distinctly stipitate ; seeds 3, or by abortion solitary, dark-brown or 

 blackish, smooth or slightly wrinkled, cochleate-reniform, 4-6 mm. long; embryo curved; 

 cotyledons curved, linear or linear-oblong. 



Type locality : Virgin River, southeastern Nevada. 



Distribution : Southern Utah and Nevada, southeastern California, Arizona, New Mexico, 

 and adjacent Mexico and lower California. 



Illustrations : Pacif. R. R. Rep. 4 : pi. 3 ; E. & P. Nat. Pfl. 3* : /. 72, A-G. 



18. RUTA (Tourn.) L. Sp. PI. 383. 1753. 



Strong-smelling perennial herbs, often woody at the base. Leaves alternate, glandular- 

 punctate, simple to much divided. Flowers perfect, in terminal corymbose or panicled 

 cymes. Sepals 4 or 5, persistent. Petals 4 or 5, often dentate or crenate, sometimes 

 fringed, yellow or greenish, imbricate. Disk thick, 8-10-lobed. Stamens S or 10, inserted 

 at the base of the disk. Ovary 4- or 5-celled, sessile, more or less 4- or 5-lobed ; style 

 central ; stigma small. Ovules several in each cavity. Capsule 4- or 5-celled, 4- or 5- 

 lobed. Seeds angled ; endosperm fleshy ; embryo slightly curved ; cotyledons sometimes 

 2-parted. 



Type species, Ruta gravcolcns L. 



Petals entire or toothed ; lobes of the capsule rounded. 1. R. graveolcns. 



Petals fringed ; lobes of the capsule pointed. 2. R. chalapensis. 



1. Ruta graveolens L. Sp. PI. 383. 1753. 

 An ill-scented, glaucous, perennial herb, 3-8 dm. tall, woody at the base; leaves twice 

 or thrice pinnatelyorternately divided, commonly triangular in outline, the segments oblong 

 to obovate, rounded, notched or sometimes acute at the apex ; sepals lanceolate to triangular 

 or sometimes ovate, entire or crenulate, 3-4 mm. long ; petals with an involute margin and 

 apex, entire or toothed, 5-8 mm. long ; ovary with rounded lobes ; capsule obovoid, 8-12 mm. 

 broad, the apex of the lobes rounded. 



Type locality : Southern Europe. 



Distribution: Waste places and cultivated grounds, eastern United States. Introduced from 

 Europe and thoroughly naturalized in some localities. 



Illustrations: Nees, Samml. Off. Pfl. pi. 376; Gaertn. Fruct. pi. Ill; Thome, Fl. Deuts. 

 pi. 32.'; Wagner, Deuts. Fl. /. 236; Mem. Mus. Paris 12 : pi. 17, f. 9 ; Woodv. Med. Bot. pi. 174 ; 

 Hayne, Arzn. Gew. 6: pi. 8 ; Guimp. & Sehlecht. Abb. 2 : pi. 1S6 ; Fl. Deuts. ed. S. pi. 2088 ; 

 Coste, Fl. Fr. /. 70S ; Plee, Types Gen. PI. 2: pi. 97; Baillon, Hist. PI. 4: /. 391-394 ; Bentley & 

 Trimen, Med.'Pl. 1 : pi. 44. 



2. Ruta chalapensis Y,. Mant. 69. 1767. 



Ruta bracteosa DC. Prodr. 1 : 710. 1824. 



A glaucous herb reaching the size of the preceding ; leaves twice or thrice pinnately 

 divided, the segments linear to elliptic or obovate, rounded or notched at the apex ; sepals 

 ovate, crenulate, 3.5-4 mm. long ; petals with an involute margin and apex, fringed, 7.5-9 

 mm. long; ovary with pointed lobes; capsule ovoid, 7-9 mm. wide, the apex of the lobes 

 pointed. 



Type locality : Africa. 



Distribution : El Monte, Los Angeles County, California ; Mexico ; Costa Rica ; Cuba ; Porto 

 Rico : Jamaica ; Haiti ; also in South America. Introduced from the Old World. 



Illustrations: Sibth. Fl. Graeca pi. 368 ; Fl. Deuts. ed. 5. pi. 2090; Coste, Fl. Fr. /. 704. 



19. CNEORIDIUM Hook. f. in Benth. & Hook. Gen. 

 PI. 1 : 312. 1862. 

 Evergreen shrubs, with grayish bark and terete branches. Leaves opposite, or fascicled 

 on short branches, pellucid-punctate. Flowers perfect, on axillary or terminal peduncles. 



