I've read that. If you produced that article, I have some suggestions to correct it.
Passion flower (Passiflora) is a known flower and that name imo should not be used to describe Jin Yong's 'Love flower'.
Passion in 'Passion flower' doesn't mean 'love', it (from a Latin word) means 'the sufferings of Christ' especially the sufferings of Christ during the Passion Week.
I think you have at least heard of the film 'The Passion of the Christ' depicting the last 12 hours in Christ's life.
Passiflora (Passion flower)
Brief overview of the history of the passion flower. It got its name from descriptions of its flower parts supplied by priests in the 'New Spain'. (South America) These were interpreted in 1609, by Jacomo Bosio in Rome, as representing various elements of the Crucifixion, five petals and five sepals (the ten disciples, minus Judas & Peter); outer fringe (the crown of thorns); five stamens (number of wounds Christ received) & knob-like stigmas of the pistil (the nails). This symbolism is not universal however, in Japan it is known as 'The Clock Plant'.
http://jubay.hp.infoseek.co.jp/ag-passion.jpg
Passion - the sufferings of Christ during the Passion Week (Holy Week) - the week before Easter Sunday.
Passion Sunday (Palm Sunday) - the day Jesus entered Jerusalem was the day before the Holy Week.
Holy Week is the week from Holy Monday through Easter (Resurrection) Sunday.
Passion fruit (Maracuja)
Passion Play - theatrical play about the Passion of Christ
The Passion Flower symbolism, as originally perceived, and then augmented, includes:
The spiraled tendrils - the lash of Christ's scourging
The central flower column - the pillar of the Scourging
The 72 radial filaments - the Crown of Thorns
The top 3 stigma - the 3 Nails
The lower 5 anthers - the 5 wounds
The Style - the Sponge used to moisten Christ's Lips with Vinegar
The leaves (some species) - the head of the Centurion's Spear
The red stains - Christ's Blood Drops
The Round Fruit - The World Christ came to save
The Fragrance - The Spices prepared by the Holy Women
This multiple symbolism of the Passion Flower combines a
number of symbols found in flowers individually in the prior
traditions of the rural countrysides of the Old World, from which
the missionaries to the New World came.
Thus, in the popular oral religious traditions of Spain,
Paliurus aculeatus was known as Espina de Cristo, "Christ's Thorn"
(by which name it is generally known today) and Espina Santa, "Holy
Thorn"; Pichomon acarna (?) as Azota-Christos, "Christ's Lash";
Gentiana cruciata, Cross Gentian, and others, as Hierba en Cruz,
"Herb of the Cross"; Ophioglossum vulgatum, Adder's-Tongue Fern, as
Lanza de Cristo, "Christ's Lance"; and Fumaria officinalis,
Fumitory, as Sangre de Cristo, "Christ's Blood". Familiarity with
these or other plant symbols of the Passion and Cross of Christ no
doubt pre-disposed missionaries and their converts to discover
symbolism such as that of the Passion Flower, and to make
transferrences such as that of the symbolism of "Mary's Gold" from
the European Marigold, Calendula, to the golden Tagetes genus of the
New World.
Such symbols gave a specific focus of Christian faith to
the religious sense of nature, and also provided a visual means
of teaching the Gospel story in an era where there were no
printed catechisms.
And, once introduced into Europe, the Passion Flower soon
acquired other religious names, such as in Germany, Jesus-Leiden,
"Jesus' Passion"; Christos-Strauss, "Christ's Bouquet"; Herr-
Gotts-Blume, "Our Lord's Flower"; Dorn-Krone, "Crown of Thorns";
Christos-Krone, "Christ's Crown"; Marter, "Martyr"; and
Muttergottes-Schurzchen, "Mother-of-God's Star".