124 



13- P- AMBIGUA, Nutt. Genera, ii. 89, (1818). 



P. 7'crtitillata, L. A^ar. ambigua. Wood, Bot. and Flor. 80, 

 (1870). 



Much resembling the preceding, but taller, 5'- 16' high, 

 generally more slender and the branches more fastigiate; 

 while the lower stem-Ieares are in many cases verticillate 

 most of the leaves of the plant are alternate; spikes, as a rule, 

 longer than in the preceding, less compact, the flowers at the 

 base of the spike often quite distant from each other; the 

 peduncles often several inches in length; flowers rather 

 larger, wings often purple, somewhat circular in out- 

 line, venose, the mid-vein and two lateral veins noticeable; 

 mature capsule apparently less elongated, hardly longer than 

 the wings which are more or less closely apprcsscd to it so 

 as to conceal it from view. 



F 



Netv Jersey. — Nuttall. (type). Pennsylvania.— -i'^})^, H. 

 Detwiller; near Philadelphia, Herb. PhiL Acad. Nat. Sci.; 

 Chester Co., 1889, Witmer Stone; Mercersburg, 1844 and' 

 1850. Herb. Porter; Philadelphia, 1824, " Nuttall misit. " in 

 Herb. Gray; Columbia Co., Ruckhorn, 1889, A. A. Heller; 

 Chester Co., W. Nottingham. 1889, T.C. Porter ; Chester Co., 

 Lincoln, 1887, T. C. Porter; Chester Co.. Corcoranville, 1883, 

 Dr. J. B. Brinton; Lancaster Co., 1861, T. C. Porter, Smith- 

 ville, 1865, T. C. Porter., Delaivare.~\'^62, Herb. Wm. M. 

 Canby. Maryland. — Garrett Co., 1879. J. D. Smith. Virginia. 

 Natural Bridge, 1885, Dr. and Mrs. N. L. Britton. West 

 Virginia. — Wood Co., 1 890, Dr. C. F. Millspaugh. Kentucky.. 

 — Mudli^k, Dr. C.W. Short; Greenville, 1 840, Dr. C. W. Short; 

 "Hills about Crab Orchard," 1835, Dr. Robert Peter. Ten- 

 nessee. — Grainger Co., 1880, J. D. Smith ; base of Chilhowee 

 Mts., A. H. Curtiss, No. 503 (in part). Georgia. — Herb. 



Chapman. Alabama. — La Grange, Prof. Hatch. Louisiana. — 

 Hale. 



J 



Type in Herb. Acad. Nat. Sci. Phila. 



# 



14. P. INCARXATA, L. Spec. PI. 701, (1753). 



More or less glaucous ; stem erect or ascending, usually 



