Ferocactus rostii sp nov

Sometimes growing in clumps of 8 to 10 heads but usually slender- cylindric, up to 3 meters high; ribs 16 to 22, rather low (hardly 1 cm. high), obtuse, somewhat tubercled; areoles large, white-felted, approximate; spine-clusters closely set, the spines interlocking and almost hiding the body of the plant; radial bristles sometimes wanting but when present 2 to 8, white or yellowish; spines about 12, sometimes fewer, 3 or 4 central, those on the lower part of the plant more or less spreading, those at or near the top erect, somewhat flexible, flattened, annulate, pungent, either straight or curved at apex, perhaps never hooked, usually yellow but sometimes reddish on young plants but also turning yellow in age; flowers dark yellow; fruit red.

BRITTON AND ROSE, VOL

PLATE XVI

BRITTON AND ROSE, VOL

PLATE XVI

Organic Ferocactus

1. Top of flowering plant of Ferocactus hamatacanthus.

2. Flowering plant of Sclerocactus whipplei.

3. Top of flowering plant of Ferocactus latispinus.

(All natural size.)

According to Mr. E. C. Rost, for whom the plant is named, this species extends from the western fringe of the Imperial Valley, California, almost to Jacumba and down Lower California for about 40 miles.

Mr. Rost's note on a plant sent to the New York Botanical Garden is as follows:

"This cluster of yellow-spined plants shows in the main plant the appearance of being wrapped in straw. All of the mature plants of this variety have the same peculiarity. Note that the young offshoots of this specimen show a number of bright red spines, which disappear in the mature plants. One specimen I found to be 8 feet in height as shown in photograph. Some of the plants are single, but many are clustered."

This is a very striking plant, perhaps nearest F. acanthodes, but with a much more slender stem, and more appressed spines and these straw-colored.

The type is based on a plant collected in Lower California, 40 miles south of the International Boundary Line (Rost, No. 327).

Figure 153b is from a photograph taken by E. C. Rost at the type locality in 1921.

DESCRIBED SPECIES, PERHAPS OF THIS GENUS.

EcHiNOCACTus haematacanthus Monville in Weber, Dict. Hort.

Bois 466. 1896.

Echinocactus electracanthus haematacanthus Salm-Dyck, Cact. Hort.

Simple, sometimes perhaps proliferous, short-cylindric, 5 dm. high, 3 dm. in diameter; ribs 12 to 20, stout, light green; spines all straight, reddish with yellowish tips, the radials 6, the centrals ,3 to 6 cm. long; flowers funnelform, 6 cm. long, purple; scales of the ovary round, white-margined; fruit ovoid, 3 cm. long.

Type locality: Not cited.

Distribution: Between Puebla and Tehuacán, according to Weber.

We do not know this species and our description is based on Weber's. His differs from the original where the central spine is described as solitary and reflexed. Schumann does not seem to have understood this species, as he first placed it after E. pilosus. Echinocactus gerardii Weber (Dict. Hort. Bois 466. 1896) is referred here by Schumann but it seems never to have been described.

Echinocactus rafaelensis Purpus, Monatsschr. Kakteenk. 22: 163. 1912.

In clusters of 8 to 10, globose to short-cylindric, light green, at the apex slightly depressed and woolly; ribs 13 to 20, prominent; areoles elliptic; radial spines 7 to 9, 3 cm. long, the upper ones somewhat connivent; central spine solitary, 4 to 6 cm. long; flowers and fruit unknown.

Type locality: Minas de San Rafael, San Luis Potosí, Mexico.

Distribution: Known only from the type locality.

We do not know this species and place it here on the statement of Quehl, who writes that it is similar to E. robustus and E. flavovirens.

Illustration: Monatsschr. Kakteenk. 23: 35, as Echinocactus rafaelensis.

17. ECHINOMASTUS gen. nov.

Plants small, globular or short-cylindric, ribbed, the ribs low, more or less spiraled, divided into definite tubercles; areoles bearing several acicular spines with or without stouter central ones; flowers central, medium-sized, home at the spine-areoles, usually purple; fruit small, short-oblong, scaly, becoming dry, dehiscing by a basal opening; scales few, their axils naked; seed large, muricate, black, with a depressed ventral hilum.

Fig. 153b.—Ferocactus rostii.

maotog

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