MORNING-GLORY FAMILY 123 



10. C. polymorphus Greene. Modoc Morning-glory. Steins slender, erect 

 or trailing, 1 to 2 feet long, sometimes feebly twining from the sterile leafy tips; 

 herbage pale and puberulent throughout; leaf -blades reniform-hastate to narrowly 

 subsagittate, mucronate, 1/2 to 1 (or II/2) inches long; axils of the middle leaves 

 bearing short peduncles; peduncles 1-flowered, equaling or somewhat exceeding 

 the leaves; calyx subtended by a pair of narrowly elliptic to lanceolate green bracts 

 at a short distance below it, their tips enclosing the bases of the sepals; sepals very 

 unequal, the inner often broadly ovate and obtuse; corolla white, 1 to ly^ inches 

 long. 



Bushy or wooded slopes, 2500 to 6000 feet : northern Sierra Nevada from Ne- 

 vada Co. to Modoc Co.; North Coast Ranges from Lake Co. to Siskiyou Co. North 

 to southern Oregon. May-July. 



Locs. — Sierra Nevada: Summit Soda Sprs., Kennedy 4' Doten ; Jonesville, Butte Co., Cope- 

 land 674; Mineral, e. Tehama Co., J. Grinnell; Fall River Valley, Shasta Co., Baker 4- Nutting ; 

 Fort Bidwell, Manning 40. North Coast Ranges: Kelseyville, Lake Co., Jepson 14,520 ; Longvale, 

 Mendocino Co., Tracy 6235; Bull Creek, Humboldt Co., Jepson 16,700; Little Hors-Linto Creek, 

 Trinity Summit, Tracy 15,531 ; Rosewood, w. Tehama Co., Jepson 14,521 ; Van Duzen River, Tracy 

 3974 ; Yreka, Butler 764. The foregoing material indicates that this species should, possibly, be 

 regarded as no more than a variety of Convolvulus purpuratus. 



Refs. — Convolvulus polymorphus Greene, Pitt. 3:331 (1898), n. Cal. and s. Ore.; Jepson, 

 Man. 778 (1925). 



11. C. purpuratus Greene. Stem woody below, climbing over shrubs and trees, 

 4 to 8 feet high ; herbage glabrous ; leaf -blades 1 to 2iA inches long, triangular -lance- 

 olate to narrowly lanceolate, acute or acuminate, sagittate at base, the basal lobes 

 quadratish, angularly lobed; bracts slender; corolla purple, IV2 to 1% inches long, 

 its limb lyo to 1% inches broad. 



Dry brushy slopes, 10 to 1000 feet : islands in San Francisco Bay and adjacent 

 mainland in San Francisco and Marin counties. Apr. 



Locs. — Sheep Isl., Tidcstrom ; Angel Isl. ; Tiburon ; Presidio, Tidestrom. The corolla in the 

 species is longer, the limb wider and the throat broader than is usual in the varieties. There are, 

 however, intergrades mtli the -widely spread white-flowered varietal forms. 



Tax. note. — The Convolvulus of stream banks and canon sides in the Coast Ranges and north- 

 ern Sierra Nevada foothills, with perennial climbing main stems and white flowers, described be- 

 low as C. purpuratus var. f ruticetorum, is a fairly common and widely distributed morning-glory, 

 having a longitudinal range of four hundred miles. It has been known as Convolvulus luteolus 

 Gray (1876) for sLxty years. Under the International Rules of Nomenclature, as amended in 

 1930, the name Convolvulus luteolus is no longer a legal name, since it is a later homonym, there 

 being in existence a prior Convolvulus luteolus Sprengel of the year 1825. The next available 

 name in the group is Convolvulus purpuratus Greene (1898), the type of which is not the usual 

 white-flowered form but the purple-flowered variety, Convolvulus luteolus var. purpuratus Greene 

 (1894), a narrow varietal endemic limited to a few square miles on the islands of San Francisco 

 Bay and the adjacent counties of San Francisco and Marin. Therefore, under the rules this 

 purple-flowered form takes on specific rank and is to be knomi as Convolvulus purpuratus Greene, 

 while the white-flowered form, formerly of specific rank, now becomes the variety and is to be 

 known as var. fruticetorum House, the oldest name in the varietal category for this form. These 

 findings are in accordance with the International Rules, but the result nomenelatorially is not 

 pleasing. The decisions are not in harmony with a philosophical view of these plants from the 

 standpoint of biology and plant geography. It is much more rational to look upon the abundant 

 widely distributed white-flowered form as the species with a species name, and to consider the 

 purple-flowered rare variant as a variety with a varietal name. Nevertheless, the rules are fol- 

 lowed and we describe the varieties as follows : 



Var. fruticetorum House. Brush Morning-glory. (Fig. 364.) Stems woody below, 2 or 5 

 to 20 feet high, climbing over trees and shrubs and cord-like in age ; herbage glabrous and glau- 

 cous, or rarely with the leaves minutely puberulent beneath ; leaf -blades 1 to 2 or 3 inches long, 

 sagittate at base, the upper portion or terminal lobe varying from triangular to narrowly lance- 

 olate ; basal lobes large, very variable (sometimes nearly as large as the terminal lobe), angular 

 with V-shaped basal sinus, or squarish with the basal sinus narrowly linear or quite closed, shal- 

 lowly 2-lobed, or somewhat saliently and acutely lobed ; petioles usually about the length of the 

 blades ; axils of the middle leaves Ijearing the peduncles, these filiform, 1 to 2 or 5 inches long, 

 commonly 1 to 3 (or sometimes 5) -flowered: bracts subulate, lanceolate or oblong, acute, 2 to 5 

 lines long, distant their length to V2 their length from the calyx; sepals obtuse, unequal, firm, 

 coriaceous, the two outer ones short; corolla open-funnelform, creamy white or white, exposed 



