1061 
SIEGESBECKIA Jorullensis. 
Jorullo Siegesbeckia. 
SYNGENESIA SUPERFLUA. 
Nat. ord. Cowrosrrx. Sect. Helianthee Milleriæ. Cassini op. 
phytol. 2, 205. 
. SIEGESBECKIA L.—Involucrum duplex; exterius pentaphyllum patens, 
interius polyphyllum campanulatum, Receptaculum paleaceum. — Floscult 
disci hermaphroditi tubulosi, radii nonnulli unilaterales ligulati feminei. 
A kenia tetragona calva. Herbe glanduloso-viscose. ^ Folia opposita, 
integra. Flores terminales et alares lutei. Kunth. synops. 2. 506. 
S. Jorullensis; foliis ovato-rhombeis acutis basi valdé angustatis dentatis 
. hirtellis, foliolis involucri exterioribus longissimis. Kunth. synops. 2. 506. 
Annua. Caules erecti, subteretes, ramosi, undique pilis glandulosis obsiti. 
Folia ovato-rhombea, vix cordata, pilosa, in petiolo ipsis longiore decurrentia : 
superioribus sensem angustatis, demüm sessilibus. Flores terminales, sepiüs 
terni, pedunculis filiformibus valde glandulosis. Involucri foliola exteriora 
5, pallidè viridia, lineari-spatulata, radiantia, interioribus purpureis 3-4-pld 
longiora, undique glandulosa. Flosculi radii 6-7, lutei, breves, oblongi, 
tridentati, tubo arcuato piloso, limbi glabri longitudine. Ovarium purpureum, 
obtuse tetragonum, calvum. Flosculi disci pauci, lutei, infundibulares, tubo pi- 
loso, limbi glabri, erecti, campanulati longitudine ; ovarium ut radii, Antheræ 
mutice, appendiculá ovata planá coronate. Stylus basi leviter bulbosus. 
Stigma bifidum, laciniis ovalibus, acutis, intis sulcatis, extis pilosis. Recep- 
taculum planum, paleaceum, paleis cymbiformibus obtusis, apice glandulosis, 
quàm ovaria paulo longioribus. 
An annual plant, found by Humboldt and Bonpland on 
the Mexican Volcano of Jorullo, at the height of about 
3000 feet above the level of the sea, flowering in September. 
With us it is a hardy annual, flowering from June to 
October. | 
Our drawing was made in 1826, from plants in the 
garden of the Horticultural Society, at Chiswick, where 
they had been raised from seeds brought from Mexico by 
Charles Mackenzie, Esq. 
