258 NORTH AMERICAN FLORA [VOLUME 22 
gray; leaves 2-4 cm. long, more or less crowded at the ends of the branches, glabrous 
above, stellate-tomentose beneath, short-petioled, oblong in outline; primary divisions, of 
about 20 pairs, 4-8 mm. long, the upper confluent; secondary divisions 15-17 pairs, sub- 
alternate, decurrent, about 0.5 mm. long, entire, obovate; panicle 3-10 cm. long, leafy 
below; sepals lanceolate-deltoid, acute, 3 mm. long; petals white, rounded-obovate, 
about 5 mm. long, wavy and crenulate; stamens of about the same length ; follicles about 
5 mm. long, lanceolate, glabrous; seeds linear-lariceolate. 
TYPE LOCALITY: Low hills and valleys near William’s Mountains [Arizona]. 
DISTRIBUTION : Among rocks, from Idaho and Nevada to Arizona and southern California. 
ILLUSTRATION: Pacif. R. R. Rep. 4: pi. 5. 
2. Chamaebatiaria glutinosa Rydberg, sp. nov. 
A shrub, 1-2 m. high; bark of the young twigs brown, somewhat stellate and very 
glutinous; that of the old stems grayish-brown and glabrous; leaves 4-5 cm. long, gla- 
brous above, somewhat stellate-villous beneath; primary divisions 15-20 pairs, 6-10 mm. 
long, the upper confluent; secondary divisions 6-10 pairs, 1-2 mm. long, obovate, usually 
more or less toothed; panicle 4-5 cm. long, leafy; sepals lanceolate, 3 mm. long, acute ; 
petals rounded-obovate, 4.5-5 mm. long, crenulate; fruit unknown. 
Type collected in a precipitous cafion on the western slope of Mammoth Range, a few miles 
from Ellsworth, Nye County, Nevada, in 1868, W. B. Howard (herb. Columbia Univ.). 
DISTRIBUTION : Type locality and neighboring California. 
9. PORTERANTHUS Britton, Mem. Torrey Club 4: 115. 1894. 
Gillenia Moench, Meth. Suppl. 286. 1802. Not Gillena Adans. 1763. 
Tall perennial herbs with horizontal rootstocks, trifoliolate leaves and foliaceous stipules. 
Hypanthium cylindro-campanulate. Sepals 5, imbricate. Petals 5, convolute in aestiva- 
tion, linear-oblanceolate, clawed. Stamens 20-25, in three series ; filaments subulate; anthers 
oval, fixed by the middle of the back. Pistils 5, opposite the sepals, free or at first slightly 
connate below; styles terminal; stigmas punctiform; ovules 2-8, ventral or basal, ascend- 
ing. Follicles free, coriaceous at maturity, splitting the calyx, dehiscent along the ventral 
suture and the apex dorsally. Seeds 1-3, erect with a spongy-coriaceous coat, rugulose; 
endosperm thick, adherent to the coat; radicle inferior. 
Type species, Gillenia trifoliata Moench. 
Leaflets serrate ; stipules subulate or linear-lanceolate, entire. 1. P. trifoliatus. 
Leaflets at least of the lower leaves incised or laciniate ; stipules ovate to nearly 7 
orbicular, foliaceous, toothed. 2. P. stipulatus, 
1. Porteranthus trifoliatus (1,.) Britton, Mem. 
Torrey Club 4: 115. 1894, 
Spiraea trifoliata L. Sp. Pl. 490. 1753. 
Ulmaria trifoliata Hill, Hort. Kew. 214. 1769. 
Gillenia trifoliata Moench, Meth. Suppl. 286. 1802. 
Stem 6-12 dm. high, glabrous or nearly so; leaflets short-stalked or subsessile, lanceo- 
late, oblanceolate, obovate, or oval, acuminate, serrate, 10-14 cm. long, glabrous or puberu- 
lent above, more or less pubescent and paler beneath; stipules 5-8 mm. long, 1-2 mm. 
wide; panicle 5-15 cm. long, often leafy; hypanthium 5-6 mm. long, 3-4 mm. wide, veiny; 
sepals lanceolate, acuminate, about 3 mm. long; petals clawed, 15-18 mm. long, white, 
their blades linear-oblanceolate; follicles about 5 mm. long, obovoid, puberulent; seeds 
oblong, 3-angled, brown, warty; stamens 20-25, of equal length. 
TYPE LOCALITY: Virginia. 
DISTRIBUTION : Woodlands, from Ontario and New York to Michigan, Missouri, and Georgia. 
ILLUSTRATIONS : Bigelow, Am. Med. Bot. p/. 47; Barton, Veg. Mat. Med. #/. 5; Mem. Torrey 
Club 4: pf. 76; Britt. & Brown, Ill. Fl. f. 1888. 
2. Porteranthus stipulatus (Muhl.) Britton, Mem. 
Torrey Club 4: 115. 1894, 
Spiraea stipulaia Muhl.; Willd. Enum. 542. 1809. 
Spiraea stipulacea Pursh, Fl. Am. Sept. 343. 1814. 
Gillenia stipulacea Barton, Veg. Mat. Med. 71. 1817. 
