596 HYDRANGEACEAE 
5. M. micranthidifolia (Haw.) Small. Leaves 10-32 em. long; blades 
elliptic to ee panicles narrow: petals 2.5-3.5 mm. long, elliptic to 
elliptic-ovate: follicles 7-8 mm. long. [S. erosa Pursh.|—(LETTUCE-SAXIFRAGE 
OUNTAIN-LETTUCE. ae logs, and Ms ine Blue Ridge and Appalach- 
ian provinces, Ga. to Tenn. and Pa.—Spr.— 
8. HYDATICA Neck. Acaulescent herbs with short or slightly elongate 
eaudiees. Leaf-blades broadened upward. Petals mainly white, unequal, the 
3 upper ones abruptly narrowed into the 
2 
pu 
cies, natives of the cooler parts 
of the Northern Hemisphere. 
1. H. petiolaris (Raf.) Small. Plant 2-9 
dm. tall or rarely smaller: leaf-blades 3-30 
em. long, oblanceolate to d uie 
coarsely dentate-serrate: sepal ly de- 
flexed at maturity: petals 35-55 er eet 
the 3 upper with lanceolate blades; ; the 2 
lower ones with yellow or brown spo 
follieles 4.5-5 mm. long. D ge leu. 
canthemifolia Michx.  Spatularia MichauzW (Britton) Small. ]—(Mouxtars- 
SAXIFRAGE. )—Cliffs and aa Blue Ridge, Ga. to Tenn and Va. 
TILBE Hamilt. Perennial caulescent herbs.  Leaflets numerous, 
the temna] one 3-lobed. Flowers very numerous, in spikes, racemes or pani- 
cles. Petals 5, or rarely 4, long and narrow, white, or wanting. Follicles 
erect.—About 7 species, North American and Asiatic.—F'ALSE GOAT’S-BEARDS. 
FEATHER-TREES. 
Leaflets sharply toothed or lobed: fruit 4-5 mm. high. 1. A. biternata. 
Leaflets erenately toothed or lobed: fruit 3 mm. high. 2. A. crenatilobata. 
1. A. bit ern ber, Britton. Plants 1-2 m. tall: leaflet i Soles 
serrate or in icle 1-3 dm. long; = p d -spatulate 
long, or Pe. in ect flowers NN 
conic, the follicles 4-5 mm. 
dodecandra Don. A lr are, ex- 
tending into adj. provi Ga. to Tenn. 
and Va.—Spr Ei eben: ducis in habit, 
but more graceful. 
2. A. crenatiloba pA Small Plants 
rather smaller than those of A. biternata: 
leaflet-blades erenate, the teeth mucronate- 
tipped: fruit ovoid, the follicles 3 mm 
Mt 
long.. Woods, Roan Mt. region, Blue Ridge, 
n —Interesting, not 
only in being two pa D very large herbs, 
but also, as in the c f Tiarella, a pair 
of species, the. one widely distributed; the other very local. 
TAwiLy 6. HYDRANGEACEAE—HYDRANGEA FAMILY 
ubs or trees, or vines. Leaves mostly opposite; blades often 
toothed. Flowers borne in raceme-like, corymb-like, or panicled cymes. 
