169 
vBursera stenophylla Sprague et Riley, sp. nov.; affinis B. bipinnaiae 
Engler, foliis laxius bipinnatis infructescentias duplo excedentibus, 
internodiis rhacheos longioribus, foliolis longis angustis ob inter- 
ous elongata pinnarum remotis, arillodio pyrenam circiter 
—% tegente facile distinguenda. 
‘badnétals satis graciles, vix ultra 2 mm. diametro 10 cm. infra 
apices, cinereo-fusci, costulati, hornotini angulati, minute 
pubescentes, annotini glabrati. Folia 5-5-13 cm. longa, bi- 
pinnata, nodis rhacheos 7-11, quorum superiores 3 (rarius 2—4) 
foliola solitaria sessilia, reliqui pinnas 1—6-jugas praeter nonnullas 
unifoliolatas ferunt; rhachis minute pilosa; rhachillae internodia 
ut rhacheos internodia superiora anguste alata; foliola lateralia 
pinnarum  elliptico-vel-obovato-oblonga, apice obtussima, in 
basin -+ oblique angustata, 3-7 mm. longa, 1-2-2-:5 mm. lata, 
tenuiter coriacea vel chartacea, glabra, margine tandem ++ 
revoluta, supra opaca rete venarum inconspicuo, subtus costa 
prominente rete distincto leviter impresso; foliola terminalia 
oblanceolato-linearia, 7-13 mm. longa, 1-5-2 mm. lata. IJnfruc- 
tescentia rhachi 2-2-5 cm. longa sulcata minute pilosa. Drupa 
bivalvis, ellipsoidea, apiculata, 8-9 mm. longa, 5 mm. diametro, 
striata, glabra. Pyrena compresso-ovoidea, acuta, 5-6 mm. 
longa, 4-4-5 mm. lata, }-3 tantum arillodio obtecta.—B. 
bipinnata S. Wats. in Proc. Am. Acad. xxi. 421 (1886), non Engl. 
~“South-western Chihuahua : Hacienda San Miguel, Palmer 200 
(type in Herb. Kew.). Sinaloa: Choix, Las Jicaras, 500 m., 
Gonzalez 894. 
Vernacular names “ Jaboncillo”” (Chihuahua) “ Palo Copal ”’ 
Rieke) 
According to Palmer, B. stenophylla is a “ copal-varnish 
tree,” 10 ft. high and 2-6 in. in diameter, with short compact 
branches and very brittle wood. The nut is black, and is covered 
below with a fleshy orange-coloured pulp (the aril-like mesocarp). 
B. tenuifolia Rose in CNH. iii. 314 (1895); Zoe v. 204 (“ te 
tenuiflora Rose ’’).—Terebinthus tenuifolia Rose in CNH. x. 122. 
Elaphrium tenuifolium Rose in Am. Fl. xxv. 252. 
Lodiego, Palmer 1581; Culiacan, Piistegs 
B. sp. 
San Ignacio: Rancho del Zapote, 540 m., Gonzalez 413. 
Vernacular name “ Copalillo. 
Possibly a form of B. acutidens Sprague et Riley (see sada 
but the specimen is without fruit and cannot be determined 
with certainty. The leaves are less pilose, and the leaflets more 
coarsely toothed than in the type of B. acutidens. 
[Descriptions of two new Mexican species of Bursera are 
appended. 
/Bursera acutidens Sprague et Riley, sp. nov.; affinis B. Palmert 
8. Wats., foliolis planis tenuioribus, subtus grosse pubescentibus 
nec tomentosis, rhacheos alis acute dentatis, drupa obtusiore 
magis pilosa, pyrena subglobosa haud alata distinguenda. 
