KEY TO THE HPECIES 55 



10. GAURA (Gaura) 



Herbs with narrow alternate nearly entire leaves, racemose flowers, narrow 

 calyx-tube with 4-lobecl limb and an indehiscent nut-like fruit.- 



1. Gaura coccinea Pursh (Scarlet Gattra). Several stemmed and more or 

 less branched, whitish-pubescent or nearly glabrous ; leaves linear-lanceolate ; 

 flowers red or scarlet ; capsule 4-sided at summit. 



XLV. UMBELLIFER^ (Cakrot Family) 



HerljS with alternate compound leaves having expanded 

 sheathing petioles, small flowers in umbels, minute or obsolete 

 calyx, 5 petals, 5 stamens, 2 styles, and an inferior 2-celled 

 ovary which splits in fruit into 2 seed-like fruits, each of which 

 has usually 5 longitudinal ribs and 1 or more longitudinal oil- 

 tubes in the intervals between the ribs and also on the face or 

 commissure of each. (See Plant Relations, p. 83, Fig. 77 ; also 

 Plant Structures, p. 267, Fig. 253.) 



* Flowers yellow ; fruit flattened laterally. 



1. Musineon. Acaulescent ; leaves pinuately decompound ; oil-tubes 3 in the 

 intervals. 



2. Harbouria. Stems erect, few-leaved ; leaves ternately decompound ; oil- 

 tubes solitary in the intervals. 



3. Zizia. Stems erect, branching ; leaves simple or of 3 large leaflets ; oil- 

 tubes solitary in the intervals. 



* * Flowers white ; fruit long, linear, nearly terete, oil-tubes wanting. 



4. Waghingtonia. Slender plants, 4-7 dm. high, with ternately compound 

 leaves. 



* » * Flowers white ; fruit short, oblong or oval, flattened dorsally oil-tubes 

 present. 



5. Phellopterus. Stemless, the crowded umbel at the base of the rosette of 

 much longer leaves ; oil-tubes 1-3 in the intervals. 



6. Lomatium. Nearly stemless, leaves basal ; umbel on a long (1-3 dm.) 

 naked peduncle ; oil-tubes solitary in the intervals. 



7. Heracleum. Large coarse perennial 1-2 m. high, with large ternate 

 leaves ; oil-tubes solitary in the intervals. 



1. MUSINEON (Musineon) 



Perennials with thick, usually fleshy, elongated roots, the very short stems 

 simple or dichotomous ; leaves about twice pinnate ; the segments small, oblong 

 or linear ; the ribs on the carpel similar and filiform. 



1. Musineon divarlcatum (Pursh) C. & R. (Leafy Musineon) Decumbent- 

 spreading, glabrous ; leaves bi-pinnatifid with winged racbis ; peduncles 6-12 cm. 

 long, rarely surpassing the leaves ; fruit smooth. Sandy plains. 



