106 
The Evansia Section 
t /. CRIST AT A 
(Plate XXV) 
Solander in Art. Hort. Kcw. I. p. 70 (1789)- 
Smith, Spicilcgium t. 13 ( 1790 - 
•Bot. Mag. t. 412 (1798). 
•Red. Lil. VII. t. 376 (1813). 
•Lodd. Cab. t. 1366. 
Baker in J. L. S. XVI. p. 143 (1877). 
Hdk. Irid. p. 23 (1892). 
Synonym. 
Neubeckia cristata, Alef. BZ. XXL p. 297 (1863). 
Synonym. 
fJVar. lacustris. 
I. lacustris , Nuttall, Gen. Amer. I. 23 (1818). 
[N.B. This name may be retained as that of a local form or variety but it hardly deserves specific 
rank. Cf. Observations, p. 107.] 
Distribution. The Eastern United States. 
Georgia. Lookout Mt, near the Tennessee Boundary, 1906, Churchill (K). 
Whitfield Co., Gordon Springs, 1900, Harper (K). 
South Carolina. 1841, Gray and Carey (K), 18 — , Hb. Booth (C). 
Oconee Co., Newry, 1906, House no. 1962 (W). 
North Carolina. Broad River Cataract, 1841, Rugel (BM) (V). 
Looking Glass Mt, Pisgah Forest, 1909, House no. 4160 (W). 
Biltmore, 1896, Biltmore Hb. (K) (V). 
Virginia. Marion Smyth Co., Middle Fork, Holston R. 1892, Small (K). 
Campbell Co., 1872, Curtiss (BM). 
Washington , D.C. 1896, Steele (E). 
Kentucky. Bath Co., 1833, Griswold (E). 
Common along watercourses, 18 — , Short (K). 
Arkansas. 1837, Engelmann (B) and Hb. Braun (B). 
Ohio. Cleveland, 18 — , Krebs (B). 
Var. lacustris. Wisconsin, 18 — , Torrey (BM). 
Lake Huron, Chicken Bay, 1871, Macoun (K). 
Diagnosis. 
I. cristata Evansia ; rhizoma gracile, stolones plures emittens ; caulis brevissimus, vix digitalis ; 
segmenta omnia patentia, exteriora cristis tribus longitudinalibus undulatis loco barbae ; semina appendice 
cartilaginea longa instructa. 
Description. 
Rootstock, a slender rhizome, spreading by means of long stolons ; in cultivation a single rhizome 
sends out as many as 6 or 8 of these stolons to form new rhizomes for the following year. In the 
wild state, growth often extends for 8 — 12 in. without any lateral shoots. 
Leaves, about 6 in. by $ — £ in. at flowering time, subsequently increasing to as much as 12 in. by 
1^ in. ; ensiform, not very rigid, finely ribbed, of a somewhat yellowish green. 
Stem, short, not more than 1 in., bearing near the base 2 — 3 reduced leaves. 
Spathes, 1 — 2 flowered, green, sharply keeled, acuminate, slightly inflated, 2^ — 3 in. 
Pedicel, £ in. 
Ovary, trigonal, with a slight groove on each face, £ in. long, tapering at either end. 
Tube, i£ — 4 in. long, distinctly trigonal, becoming wider above. 
Falls. The somewhat blunt and broad obovate blade is not separated by any constriction from 
the wedge-shaped haft, which bears three parallel ridges. The central ridge is crinkly, white, tipped 
with orange ; those on either side are orange or brownish yellow on the inner face, beyond which 
the colour becomes lilac purple. On the blade the end of the central ridge or crest becomes white, 
tipped and dotted with lilac purple. Around this there is a white patch, edged with deep lilac purple, 
which shades away into the plain paler lilac of the rest of the blade. 
Standards, obovate unguiculate, emarginate, lilac purple. 
Styles, narrow, keeled, pale lilac. 
Crests, long, narrowly triangular. 
Stigma, oblong, entire. 
Filaments, white, tinged with pale mauve, attached to the base of the central ridge of the falls. 
Anthers, cream. 
Pollen, white. 
