100 



APOCYNACEAE 



narrowly membranoiLs-margined ; corolla wliitish, often indigo in age, its lobes 

 half as long as the tube; follicles inclined to break into one-seeded joints. 



Desert plains and canons, 2300 to 4000 feet : 

 north side of the Colorado Desert; eastern Mohave 

 Desert. Ea.sttoUtah. Apr.-May. 



Locs. — North side of Colorado Desert: Monsen Ca- 

 non, Eagle Mts., Weeks; Cottonwood Pass, Cottonwood 

 Mts., Eall 6007 ; betw. Quail Spr. and Lost Horse Canon, 

 Clary 1173. Eastern Mohave Desert: Cactus Flat, n. slope 

 San Bernardino Mts., Parish 3769; Mitchells Caverns, 

 Providence Mts., Mary Beal 476; Leastalk, Parish. 



Eefs. — Amsonia tomentosa Torr. & Frem.; Frem., 

 Bep. Sec. Exped. 316 (1845), "probably west of the Rocky 

 Mts.," Fremont. A. brevifolia var. tomentosa Jepson, Man. 

 768 (1925). 



2. A. brevifolia Gray. (Fig. 347.) Similar 

 to A. tomentosa; stems 6 to 10 inches high; herb- 

 age glabrous ; calyx-lobes membranous-margined ; 

 corolla whitish with a tinge of lavender, drj-ing 

 bluish; ovary obtusish. 



Di-y flats and canon sides, 3000 to 5000 feet : 

 north side of Colorado Desert; southern Mohave 

 Desert; Inyo Co. East to Utah. Mar. -Apr. 



Tax. note. — Amsonia brevifolia is remarkably similar 

 to A. tomentosa in habit, leaves, inflorescence and flowers. 

 The range of these two species is the same and probably 



they are never 



Pig. 347. Amsonia brevifolia 

 Gray, a, habit, X % ; 6, fl., X 1% ; 

 c, long. sect, of fl., X 1% ; d, follicle, 

 X%. 



1. V. major L. Peeiwinkle. 

 corolla blue, 1 to li/4 inches broad. 



Fig. 346. Amsonia tomentosa 

 Torr. & Frem. a, habit, X % ; 6, fl., 

 X 2^2; <", cor. spread open, X 2V2. 



found separately. 

 There is a striking lack of intergradation as to pubes- 

 cence, but other differences are doubtful. Woodson in 

 his Monograph of Amsonia assigns pointed seeds to A. 

 tomentosa and truncate seeds to A. brevifolia, but Pur- 

 pus' collections of these two species at Ash Meadows, 

 Nevada, show no significant difference as to seeds, while 

 A. tomentosa, as collected by Parish at Leastalk, New 

 York Mts., reveals quite truncated seeds. 



Locs. — Monsen Caiion, Eagle Mts., Weeks; Lookout 

 Mt. n. of Indio, Jepson 5980 ; White Tank, Piute Mts., 

 Riverside Co., Jepson 12,626 ; Rabbit Sprs., s. Mohave 

 Desert, ace. Parish; Cactus Flat, n. slope San Bernardino 

 Mts., aec. Peirson : Mitchells Caverns, Providence Mts., 

 ilary Beal 477; Willow Canon, Panamint Mts. (Contrib. 

 IT. S.Nat. Herb. 4:148). 



Refs. — Amsoni.i BREvrFOLiA Gray, Proc. Am. Acad. 

 12:64 (1876), based on spms. from s. Utah, Thompson, 

 w. Ariz., Parry, and se. Cal., Palmer; Jepson, Man. 768 

 (1925). 



2. VINCA L. 



Flowers solitai-y and axillary. Corolla sal- 

 verf orm, witli a callous constriction at the throat, 

 its lobes broad. Stigma annular, bordered below 

 by a reflexed membranous wing or cup, and 

 above by a truncate upper portion. Follicles 

 narrow, terete. — Species 5, Europe, Asia, north 

 Africa. (Ancient Latin name.) 



Sterile stems trailing, the flowering ones erect ; 



