266 NORTH AMERICAN FLORA [VoLuME 22 
14. Sericotheca argentea (I,. f.) Rydberg. 
Spiraea argeniea I, f. Suppl. 261. 1781. 
Holodiscus argenteus Maxim. Acta Hort. Petrop. 6: 254. 1879. 
Schizonotus argenteus Kuntze, Rev. Gen. 225. 1891. 
Schizonolus argenieus Mutisianus Kuntze, Rev. Gen. 226. 1891. 
A tall shrub; bark of the young twigs gray and densely tomentose, strongly angled; 
that of the old stems dark-gray ; leaf-blades oblanceolate, 1-3 cm. long, thick, white-silky 
on both sides, acute at the apex, cuneate at the base and decurrent on the short petioles ; 
inflorescence compound, ovoid, 4-8 cm. long, with ascending tomentose branches; sepals 
triangular-ovate, acute, about 1.5 mm. long; petals obovate, about 2 mm. long; stamens 
20, shorter than the sepals; carpels obliquely obovate, curved on the upper edge but less so 
than on the lower, their bodies about 2 mm. long, their beaks 1 mm. 
TYPE LOCALITY : New Grenada. 
DISTRIBUTION : Mountains of Colombia ; also reported from Costa Rica, perhaps doubtful. 
ILLUSTRATIONS: H.B.K. Nov. Gen. & Sp. p/. 562 ; Dict. Sci. Nat. pl. 258. 
DOUBTFUL SPECIES 
Spiraea mexicana Schiede; Regel, Ind. Sem. Hort. Petrop. 1857: 58. 1858 (Schizo- 
notus argenteus mexicanus Kuntze, Rev. Gen. 225. 1891), was described from speci- 
mens in the St. Petersburg botanic garden. It evidently belongs to this genus, but the 
species cannot be determined, as neither the type nor the original description has been 
accessible. It may be S. pachydisca, S. Schaffneri, or some other species intermediate 
between S. discolor and S. fissa, judging from remarks made by Maximowicz under Holo- 
discus discolor. 
Tribe 6. ULMARIEAE. Perennial herbs, with rootstocks, pinnatisect and 
incised leaves, and ample stipules. Flowers in paniculate often corymbiform 
cymes. Hypanthium flat. Disk obsolete. Stamens 20-40, of which 10 are 
shorter ; filaments subclavate, attenuate at the base. Pistils 5-15, distinct, 
opposite the petals, when of the same number ; stigma large, capitate. Carpels 
indehiscent, attenuate or stipitate at the base, coriaceous; 1-seeded. Seeds pen- 
dulous, terete, with a single coat; embryo with superior radicle. 
13. FILIPENDULA (Tourn.) Adans. Fam. Pl. 2: 295. 1763. 
Ulmaria (Tourn.) Hill, Hort. Kew. 213. 1768. 
Thecanisia Raf. New Fl. 2: 38. 1837. 
Characters of the tribe. 
Type species, Spiraca Filipendula \. 
Carpels with semicordate bases, laterally attached, leaves interruptedly pinnatifid, 7. e., with alter- 
nating larger and smaller leaf-segments. 
Carpels spirally twisted, glabrous; leaf-segments few, double-serrate. 
Leaves white-tomentose beneath. 1. F. Ulmaria. 
Leaves green and nearly glabrous beneath. 2.. F. denudaia. 
Carpels not twisted, hispid all over; leaf-segments numerous, twice dis- 
sected. 3. F, Filipendula. 
Carpels tapering at the base, attached by the very base; leaves more regularly 
pinnate or the lateral segments minute. 
Carpels sessile, plump, glabrous; lateral leaf-segments rather large, 3-5 
cleft. : 4, BF. rubra. 
Carpels stipitate, very flat, ciliate on the margins; lateral leaf-segments 
much reduced, or almost none, the terminal one large and palmate. 
Petals about 3 mm. long, distinctly clawed, blades nearly orbicular. 5. F. kamischatica. 
Petals about 6 mm. long, subsessile, elliptic or oval. 6. F. occidentalis, 
1. Filipendula Ulmaria (1...) Maxim. Acta Hort. 
Petrop. 6: 251. 1879. 
Spiraea Ulmaria \. Sp. Pl. 490. 1753. 
Ulmaria Spiraea-Ulmaria Hill, Hort. Kew. 214. 1768. 
Ulmaria palustris Moench, Meth. 663. 1794. 
Spiraea palustris Salisb. Prodr. 364. 1796. 
