GREENMAN, — GENUS RELBUNIUM. 469 
* * * Leaves lanceolate to lance-oblong, pubescent or at least ciliated ; margins 
not conspicuously thickened. 
4. R. hirsutum, Scuumann. Low prostrate many-stemmed herba- 
ceous perennial ; stems 4-angled, covered upon the somewhat thickened 
angles by a spreading hirsute pubescence: leaves lance-oblong, a centi- 
meter or less in length, 2.5 to 3 mm. broad, hirsute-pubescent upon the 
Upper surface and upon the midrib beneath, ciliate: the 1-flowered in- 
Volucres solitary in the axils; their peduncles about equalling the 
leaves. — F]. Bras. vi. pt. 6,116. Galium hirsutum, Ruiz & Pavon, FI. 
Peruy. i. 59. 
The above description has been drawn from South American material, 
which well accords with the original characterization of the species by 
Ruiz and Pavon. No Mexican specimens have been seen by the writer. 
To this species, however, Martens and Galeotti in Bull. Acad. Brux. xi. 
pt. 1, 126, doubtfully refer Galeotti’s no. 2650, collected on rocks near 
Mirador, Vera Cruz. 
5. R. ciliatum, Hemst. Low herbaceous plants: stems obtusely 
4-angled, glabrous, leaves narrowly lanceolate, 1 em. or less in length, 
acute, glabrous upon either surface, margin ciliate: peduncles axillary, 
Solitary, slender, 3 to 5 mm. long; bracts of the involucre somewhat un- 
equal, narrowly lanceolate, acute, ciliate: flowers sessile: fruit glabrous. 
— Biol. Cent.-Am. Bot. ii. 62. Galium etliatum, Ruiz & Pav. FI. 
Peruy. i, 59. G. involucratum, HBK. Nov. Gen. & Spec. iii. 335. 
Rubia ciliata, DC. iv. 591, — South Mexico in woods of El Sabino near 
the city of Mexico, Galeotti, no. 2596, acc. to Martens & Galeotti, Bull. 
cad. Brux. xi, pt. 1, 126. 
The typical plant is a native of Western South America. No Mexican 
or Central American specimens belonging to this species have been seen 
by the writer, 
* * * * Leaves lance-linear to linear, more rigid; margins conspicuously 
thickened. 
6. R. microphyllum, Hemst. Glabrous throughout: stems rising 
from a perennial base, erect or nearly so, 1 to 3 dm. high, much branched 
*20ve; branches obtusely 4-angled, faces somewhat furrowed: leaves 
5to15 mm. long, usually pungent-tipped ; margins revolute, thickened, 
“mooth : peduncles axillary, solitary: bracts of the inyolucre similar to 
the leaves but smaller: flowers sessile; corolla-lobes ovate, obtusish : 
— glabrous or rarely slightly granulose, sessile or short-pedicellate. — 
a tol. Cent.-Am. Bot. ii. 63. Galium microphyllum, Gray, Pl. Wright. 
" 80 & Syn. FIN. Ai. pt. 2, 41.—New Mexico, Wright, nos. 234, 
