UMBELLIFERAE (PARSNIP FAMILY) 359 



2. Aulospermum angustum Osterh. Bull. Torr. Bot. Club 31: 358. 1904. 

 Glabrous and glaucous, 20 cm. or more high: leaves glaucous throughout, 

 bipinnate, with crowded small segments: fruiting peduncles 10-20 cm. long; 

 umbels 5-rayed or more, with no involucre and involucels of few subulate 

 bractlets; rays about 1 cm. long; pedicels 3-4 mm. long; flowers yellow: fruit 

 6-7 mm. long, the 5 carpel wings narrow and subequal; oil-tubes 4-5 in the 

 intervals, 6 on the commissural side. Habitat and range of last. 



3. Aulospermum ibapense (Jones) C. & R. Contrib. U. S. Nat. Herb. 7: 176. 

 1900. Glabrous and glaucous: leaves tripinnate, the ultimate divisions 

 crowded, oblong, obtuse, with revolute margins: fruiting peduncles longer 

 than the leaves; umbels 6-8-rayed, with no involucre and involucels of linear 

 acute bractlets; rays about 1 cm. long; pedicels 4 mm. long; flowers white: 

 fruit 4-5 mm. long, the 5 carpel wings broad and thin; oil-tubes 3 in the in- 

 tervals, 6 on the commissural side. (Cymopterus ibapensis Jones, Zoe 3: 302. 

 1893.) Habitat and range of last. 



4. Aulospermum planosum Osterh. Bull. Torr. Bot. Club 30: 236. 1903. 

 Shortly caulescent, crowned by the numerous widely spreading leaves and 

 peduncles longer than the leaves: flowers purplish: fruit oblong, 6 mm. long. 

 Colorado. 



5. Aulospermum purpureum (Wats.) C. & R. 1. c. 178. Whole plant 

 purplish, nearly acaulescent, glabrous: leaves broadly triangular in outline, 

 twice or thrice pinnate, the segments coarsely mucronate-dentate : peduncles 

 stout, exceeding the leaves; umbel unequally 8-12-rayed, with more or less 

 elongated rays and pedicels, mostly no involucre, and involucels of lanceolate 

 bractlets united near the base and nearly equaling the yellowish-purple flowers: 

 fruit 8-10 mm. long, each carpel with 3-5 broad wings scarcely thickened at 

 insertion; oil-tubes 4 or 5 in the intervals, 8 on the commissural side:- seed 

 somewhat flattened, with broadly concave face. New Mexico to Colorado 

 and west to Utah and Arizona. 



22. CYMOPTERUS Raf. 



Dwarf, acaulescent, xerophytic plants, with small pinnate or bipinnate 

 leaves, often no involucre, usually foliaceous and conspicuous involucels, 

 and white or yellow flowers. Calyx-teeth obsolete or evident. Fruit flat- 

 tened dorsally, ovate, glabrous. Carpel with dorsal and intermediate ribs 

 filiform or winged and approximate; lateral wings broad, very thick and 

 corky, with neither nerv.es nor strengthening cells, coherent till maturity 

 with those of the other carpel, forming a broad corky margin to the fruit 

 usually thicker than the much-flattened fruit body and in cross section show- 

 ing a neck-like connection; stylopodium wanting; oil-tubes very small, 4-8 

 in the intervals, 8-14 on the commissural side. Seed very flat, with plane 

 face. 



Umbels globose, flowers white. 



Fruit with 3-5 broad wings on each carpel. 



Ultimate leaf-segments narrow and acute . . . . . 1. C. acauhs. 

 Ultimate leaf-segment short-oblong, obtuse . . . . . 2. C. Parryi. 

 Fruit with only the lateral nerves broadly winged . . . . 3. C. lapidosus. 

 Umbels open, flowers yellow. 



Leaf-segments narrow 4. C. Fendleri. 



Leaf-segments broad 5. C. Newberryi. 



1. Cymopterus acaulis (Pursh) Rydb. Bot. Surv. Nebr. 3: 38. 1894. 

 Low (7-20 cm.) and glabrous, with a short caudex bearing a cluster of leaves 

 and peduncles: leaves merging from pinnate to bipinnate; ultimate segments 

 mostly small and narrow: peduncles mostly shorter than the leaves; rays 

 and pedicels very short, making a rather compact cluster; involucel of linear 

 and entire more or less united foliose bractlets; flowers white: fruit 6-8 mm. 

 in diameter, with 3-5 broad wings on each carpel; oil-tubes small, 4-8 in the 

 intervals (or double the number where a rib has been suppressed), 8-14 on 

 the commissural side. From Colorado to Assiniboia. 



2. Cymopterus Parryi (C. & R.) Jones, Zoe 4: 48. 1893, Resembling C. 



