Vor. II.] SAXIFRAGE FAMILY. 185 
2. Hydrangea radiata Walt. Downy 
Hydrangea. (Fig. 1859.) 
Hydrangea radiata Walt. Fl. Car. 251. 1788. 
Hydrangea nivea Michx. Fl. Bor. Am. 1: 268. 1803. 
A shrub 6°-8° high, the twigs finely pubescent 
or glabrate. Leaves slender-petioled, ovate, 
rounded or cordate at the base, acute or acumi- 
nate at the apex, 3/-6’ long, thicker than those 
of the preceding species, green and nearly gla- 
brous above, densely tomentose, sometimes sil- 
very white beneath; marginal flowers, or at least 
some of them, sterile and conspicuous. 
Missouri to Tennessee and North Carolina, south 
to Georgia. Our description perhaps includes two 
species, June-July. 
11. DECUMARIA L. Sp. Pl. Ed. 2, 1663. 1763. 
Woody climbing vines, with opposite petioled leaves, and terminal corymbose perfect 
flowers. Stipules none. Calyx-tube top-shaped, adnate to the ovary, its limb 7—-10-toothed. 
Petals 7-10, narrow. Stamens 20-30, inserted on the disk; filaments subulate. Ovary 5-I0- 
celled, 10-15-ribbed, its apex conic; style thick; stigma capitate, 5-10-lobed; ovules ~. 
Capsule fragile, ribbed, opening between the ribs. Seeds numerous, the testa membranous, 
reticulated, produced into a club-shaped appendage. [Latin, decem, ten; the parts being 
often in 10's. ] 
A monotypic genus of southeastern North America, 
VA) 
V 
oy ips 
vf 
NZ 
ae. 
1. Decumaria barbara I, Decu- 
maria. (Fig. 1860.) 
oo cy i barbara I,. Sp. Pl. Ed. 2, 1663. 
1763. 
Glabrous, or the shoots pubescent, climb- 
ing by aerial rootlets to a height of several 
feet. Petioles 14’-1’ long; leaves ovate, 
acute or obtuse at the apex, rounded or 
narrowed at the base 2’—4/ long, entire or 
repand-denticulate, sometimes pubescent 
on the veins of the lower surface, glabrous 
and shining above; corymbs terminal, 
compound, 2/—3/ broad; flowers white, fra- 
grant, 3/’-4’’ broad; calyx-teeth decidu- 
ous; capsule top-shaped, 2//-3/’ high, 
tipped with the conic persistent style, 
opening between the ribs and remaining 
on the plant after the seeds fall away. 
_.In swamps, southeastern Virginia to Flor- 
ida, west to Louisiana. May-June. 
12, PHILADELPHUS L. Sp. Pl. 470. 1753. 
Shrubs, with opposite petioled simple deciduous leaves, and no stipules. Flowers large, 
terminal or axillary, corymbose, racemose or solitary, white or cream-colored. Calyx-tube 
top-shaped, adnate to the ovary, 4-5-lobed. Petals 4-5, convolute, rounded or obovate. 
Stamens 20-40, inserted on the disk; filaments linear. Ovary 3-5-celled; styles 3-5, filiform, 
distinct, or united at the base; ovules. Capsule top-shaped, 3-5-celled, at length loculi- 
cidally dehiscent by 3-5 valves, many-seeded. Seeds oblong, the testa membranous, pro- 
duced at each end. [Named after King Ptolemy Philadelphus. ] 
About 15 species, natives of North America, Mexico, Asia and central Europe. Besides the 
following, about 5 others occur in the southern and western parts of North America. Called Mock 
Orange from the orange-like blossoms of the various species. The common name Syringa is un- 
fortunate, being the generic name of the Lilac. 
