A NEW SHRUB OF THE GENUS ESENBECKIA FROM 



COLOMBIA 



By DR. K. KRAUSE, Berlin 



Among the plants collected in Colombia by Mr. Henry Pittier 

 I have found a species of Rutaceae belonging to the genus Esenbeckia 

 Kunth which I have been unable to identify with any species hereto- 

 fore known and which I venture to describe as Esenbeckia Pittieri, 

 in honor of its collector. 



ESENBECKIA PITTIERI Krause, sp. nov. 



Arbuscula erecta parva fruticulosa ramulis tenuibus subteretibus 

 vel apicem versus paullum complanatis glabris cortice dilute brunneo 

 leviter longitudinaliter striato obtectis. Folia simplicia ad ramu- 

 lorum apices dense conf erta ; petiolus brevis tenuis supra leviter 

 canaliculars basi paullum dilatatus, 1.5-2 cm. longus ; lamina tenuiter 

 coriacea utrinque glaberrima oblongo-lanceolata vel anguste ob- 

 longo-lanceolata apice latiuscule acuminata basin versus sensim 

 cuneatim angustata, 9-12 cm. longa, 2.5-3.5 cm. lata, nervis primariis 

 utrinque 4-6 angulo obtuso a costa patentibus marginem versus arcu- 

 atim adscendentibus supra paullum impressis subtus distincte promi- 

 nentibus percursa. Rami floriferi 15-16 cm. longi ; racemis tenuibus 

 divaricatim patentibus, 4-5 cm. longis, sparsissime pilosis vel omnino 

 glabris, laxifloris. Bracteae lineari-subulatae acutae. Pedicelli 

 graciles patentes, 5-8 mm. longi. Flores parvi viridescentes ; calycis 

 laciniae late ovatae apice subacutae margine minute ciliolatae, vix 

 0.5 mm. longae; petala crassiuscula ovata circ. 1.5-1.8 mm. longa 

 (in sicco nigro-punctulata) ; stamina dimidium petalorum paullum 

 superantia antheris parvis ovoideis obtusis ; discus leviter undulatus ; 

 ovarium depresso-globosum stilo crassiusculo paullum longiore 

 coronatum. 



Colombia: Forests of El Yarumal, between Corinto and Ta- 

 cueyo, State of Cauca, alt. 2,200 m., January 19, 1906, H. Pittier, no. 

 1,014; (U. S. National Herbarium, no. 531,213, type). 



This species belongs to the section Pachypetalae and, though ap- 

 parently very closely allied to E. leiocarpa Engl, and E. cornuta Engl., 

 is distinguished from these by its glabrous branches and leaves and 

 by the shape of the latter. 



Fruiting material was not collected. 



Smithsonian Miscellaneous Collections, Vol. 61, No. 16 



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