144 RUTACEiE. 



the partition, the lobes dehiscent down their inner side to 

 their junction. Seeds 8, or by abortion fewer, in each cell, 

 amphitropous, reniform ; the testa crustaceous, muricate- 

 scabrous. Embryo arcuate in the axis of thin fleshy albu- 

 men, nearly of its length : cotyledons narrowly oblong, 

 ■rather fleshy, parallel with the hilum : radicle about the 

 length of the cotyledons, superior. 



Herb low, dotted all over with glands, exhaling the strong 

 odor of Rue, with numerous nearly simple stems arising from 

 a stout and perpendicular perennial root, beset with simple 

 and entire filiform-linear alternate exstipulate leaves, race- 

 mosely floriferous above ; the short-pedicelled flowers all 

 extra-axillary, therefore terminal, becoming lateral by the 

 successive evolution of axillary buds. Petals yellow. 



Etymology, Properties, &c. Name composed of pwrj, the Rue, and 

 oa-/n7j, scent. It has just the odor, and doubtless the other sensible proper- 

 ties, of the Garden Rue. The genus is very nearly allied to Ruta and 

 Aplophyllum ; but differs from the former in its plane petals, shorter sta- 

 mens, eight-lobed disk without nectariferous pores, and muricate seeds ; and 

 from both by the two-celled ovary. 



Geographical Distribution. This single representative of the proper 

 Rue Family in the New World was recently discovered in Western Texas 

 by Mr. Lindheimer and by Mr. Wright. Dr. Gregg also gathered it at 

 Monterey, in Northern Mexico, where it is called Ruda del Campo. 



PLATE 155. RuTosMA Texana, n. sp.; — a small plant, in flower and 

 fruit, of the natural size ; from Lindheimer'' s collection. 



1. Diagram of the flower. 



2. The summit of a flowering stem, enlarged, showing the glands of the 



stalks, leaves, and parts. of the flower. 



3. Anther, with the summit of the filament, magnified; outside view. 



4. The same, seen from within. 



5. Pistil with the eight-lobed disk, &c., magnified. 



6. Vertical section of the same, showing the insertion of the organs, &c. 



7. An ovule, more magnified. 



8. Dehiscent capsule, with the persistent calyx and disk, magnified. 



9. The same, v/ith the capsule and some of the seeds vertically divided. 



10. A seed, more magnified. 



11. Vertical section of the same, and of the embryo, more magnified. 



12. Embryo detached and magnified. 



