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102 DIALYPETALOUS EXOGENS 



pie; leaflets unequally incised-serrate ; umbels globose, smoothish. 

 Angelica atropurpurea. L. $ Fl. Cestr. ed. 2. p. 193. 

 A. triquinata. MX. and Bigel. not of Nutt. DC. Nook. $c. 

 DARK-PURPLE ARCHANGELICA. 



Stem 4 to 6 feet high, and 1 or 2 to near 3 inches in diameter at base, hollow, 

 somewhat branching above. Leaflets 2 to 5 inches long, ovate ; petioles very broad, 

 and inflated. Umbels finally globose, 6 to 10 or 12 inches in diameter; umbelkts 

 globose, 1 to 2 inches in diameter; flowers greenish-white. 

 Hob. Moist, low grounds; Brandy wine: frequent. Fl. May. Fr. July. 



S8 A. liirsuta, Torr. $ Gr. Stem rather slender, striate, hoary- 



villous at summit ; leaflets equally serrate ; umbels spreading, to- 



mentose. 



Angelica triquinata. Nutt. DC. Hook. $ Fl. Cestr. ed. 2. p. 193. 



not of MX. 



HIRSUTE ARCHANGELICA. 



Stem 2 to 4 or 5 feet high, and */ to % an inch in diameter, simple, purple be- 

 low. Leaflets 1 to 2 or 3 inches long, ovate-oblong; petioles dilated and clasping at 

 base, flowers white. 

 Hob. Clearings ; borders of woods, and thickets : frequent. Fl. July. Fr. Sept. 



Obs. It appears, from the researches of Prof. A. GRAY, that this 

 is not the A. triquinata of MICHAUX, and that Dr. BIGELOW is 

 correct. 



ft Carpels not flattened ; each with 5 winged or prominent ribs. 



156. THAS'PIUM, Nutt. 



[Name modified from Thapsia, an allied genus, native of Thapsos.'] 

 Fruit ovoid ; carpels with 6 equidistant winged ribs ; channels with 

 single vittae. Yellowish-green perennials : leaves ternately dissected ; 

 involucre none ; involucels few-leaved ; flowers yellow, or rarely dark 

 purple. 



* Wings of the carpels unequal. 



1. T. barblnudc, Nutt* Stem sulcate-angled, hairy at the 

 nodes; radical leaves triternately dissected; segments cuneate- 

 ovate, incised-serrate. 



NODE-BEARDED THASPIUM. Meadow Parsnep. 



Stem about 2 feet high, somewhat branched, smooth, with a short, rather coarse 

 and dense pubescence at the nodes, and base of the petioles. Stem-leaves mostly 

 biternate ; leaflets 1 to 2% inches long. Umbels terminal and dichotomal ; involu- 

 cds of 3 or 4 subulate-linear leaves; flowers deep yellow; fruit linear-elliptic. 

 Hob. Borders of woods ; meadows, &c. : frequent. Fl. June. Fr. Aug. 



* * Wings of the carpels equal. 



2. T. aikreum, Nutt. Stem angular, smooth at the nodes; leaves 

 biternately dissected ; segments oblong-lanceolate, finely serrate. 

 Zizia aurea. Koch. ? $ Fl. Cestr. ed. 2. p. 185. 



GOLDEN THASPIUM. 



Stem 1% to 2 feet high, somewhat branched above. Leaflets 1 to 2 inches long ; 

 petioles of the radical leaves 6 to 9 inches in length. Umbels generally opposite the 

 leaves; involucels of 3 or 4 lance-linear leaves; flowers yellow; fruit oval. 

 Hob. Borders of woods, near W. Chester: rare. Fl. May. Fr. 



