218 Rhodora [SEPTEMBER 
well established in two small colonies, is very constant in all its char- 
acters and apparently well worthy of specific rank, at least tentatively. 
It differs particularly from any of the preceding in the pubescent 
stem and leaves, deeply cleft to divided stem-leaflets, the actual and 
comparative length of sepals and petals and in the surface characters 
of the rootstock: from either of the following in the situation of the 
leaves, size, shape and lobation of the leaflets and in the sepals and 
petals, together with the anomalous rootstock. 
* * * Rootstock interrupted by fragile constrictions, tuberous, obscurely 
bracteate: stems glabrous to pubescent: leaflets variable. 
D. HETEROPHYLLA Nutt.  Rootstocks interrupted by fragile con- 
strictions connecting the few narrowly fusiform annual segments 1.4 
to 3 cm. long, bearing few small bracteate tubercles on a smooth sur- 
face: premorse remains of former stems sometimes 2 to 3 mm. long: 
often deep-seated. Stems r.5 to 3.5 dm. high, glabrous or somewhat 
pubescent, commonly slender and several together with 1 to several 
basal leaves, sometimes with one or two slender few-flowered axillary 
or erratic branches bearing a simple or cleft leaflet 1.5 to 2 cm. long. 
Leaves ternate, those of the stem generally 2 (2 to 3), variably oppo- 
site, subopposite, alternate or verticillate, commonly. near top of stem 
at flowering time on petioles o.4 to 3 cm. long: basalon petioles 2 to 
15 cm. long, very different. Leaflets minutely serrulate: those of 
the stem r.3 to 3.5 cm. long, linear to narrowly lanceolate, sparsely 
and obscurely to sharply mucronate-serrate, sometimes laciniate- 
dentate or multifid; acute or acuminate at the apex, sessile to dis- 
tinctly petiolate at the tapering base: those of the base r.2 to 4.5 
cm. long, nearly the same width, prominently petiolate, and although 
sometimes similar to those of the stem, usually obtuse at base and 
apex, broadly rhombic-ovate, the central leaflet equally, the lateral 
oblique and unequally trilobate by varying clefts, the teeth and apices 
rounded and mucronate. Flowers light purple, closely cymose-panic- 
ulate at first; petals 10 to 16 mm. long, narrow, rounded at the apex, 
twice as long as the oblong-lanceolate obtuse sepals.  Pedicels 0.3 to 
2 rarely 3.5 cm. long. Pods 2.5 cm. long.-— Not known from Con- 
necticut. 
D. LaciNIATA Muhl. Rootstocks jointed at the constricted ends of 
the few narrowly fusiform to oblong, often thick tuberous annual seg- 
ments 2 to 5 cm. long, 4 to 12 mm. thick at maturity, and bearing on 
the smooth surface few small bracteate tubercles from some of which 
branches arise late in the season: segments uniformly separable at 
certain fixed places. Stems 1 to 3.5 dm. high, pubescent, at least 
above, rarely glabrous, stout, solitary or several together, with or gen- 
erally without accompanying rootleaves. Leaves primarily ternate, 
often appearing quinate, those of the stem 3, commonly near top of 
stem, verticillate or nearly so, on petioles 2 to 5 cm. long: basal usu- 
